Centre for Labour Economics, London School of Economics DiscussionPaperNo 349 June 1989 NON-COOPERATIVE WAGEBARGAINING by S. Holden A DesignatedResearchCentreof ESRC A bs tra_c t The pape r hori zon argtues that automati c A s tri k e produc ti on because pl ac e. take An the i ncorporati ng show n that perfect can model c ons equenc e occ ur in thi s equi l i bri um, in c an perfec t R ubi ns tei n al -ternati ng-offers w age negoti ati ons . an the or of other any a c onti nue probl emati c is del ay as model and equi l i bri um. of that an w hen is a s tri k e j -s s tri k es no is l onger w i th a l ength not negoti ati ons model dev el -oped. a to agreement, al ternati ng-offers c al l i ng there al -s o appl i ed ac ti on reac hi ng normal - i nfi ni te-hori z on c hoi c e w hen i ndus tri af in i nfi nj -te- i nformati on uni que in It is s ubgame real ti rne 2 NON-COOPERATIVE WAGE BARGATNTNG S tei nar H ol den Introducti on" ln ror-onf s \/e:rq cxtensi vel y thi 'ou11h n^n-cn^horaJnon-c ooperati v e i\/6 Lo the w age N ns h b.trgai ning' -i ,ec ry ul l ocsi nq these perfe.c t v r.v ti tc d ivision tl l c si ze c al c n tl 'tc to to+-a l be to do rc ' ; c rt u e the this pr oduc ti on v r age l e v e l -. b.ar gai ni n g wagc to 'li',,icieci, " c ati ng on ii: cal:e" would c! t i re . i i r. i . i ' -- -L e: s be the ciear the as usual would could v rh y j -n i n g the when a l t e rn a t e l y , cake witl; one this mi g h t p a rt i e s l:e cann:t re a d i l y as s i ro rrl d n ' t p l -a c e . tales wage b a rg a i n be costs associated to re a c h l rf re i -r -, -i c ' . ; th€ cal:, c c -, r-rt i n L ri : A n a t u ra i c o n t ra c t p a rt i e s p a rt i e s an'j nodei l re ri o a l the the O!''t- vqll( re a c h e d . c o i ' rt -ra c t existing still mo t i v a t e the fc t- R ubi ns tei ;t har-craln the p ro b l e m I , l h rl e b a rg a p ro i o n g but is c.,'.'er t,he to Th e re division i rn p o rt a n t the narties o f f e r-q t i me , n c r; o t i a t j . o n s . v rh i l e continue wtiich alr give over bas i s Tn genera. i 986) of i ' .' , al ternati ngr-offers the w rre re p a rt i e s dininish h o w e v e r, where io.l norr-c ooperat al ., i nfi ni te-hori z c n Th e a q re e n e n t io, a p p J -i e d c a l r, e . et rnnl i nC i rec --1, and on v ari ants bas ed , or (w here B i nmore Case.) l.'oon been a j us ti fi c c i ti on as c f. been fatert cake an T h e re is hav e a the until us ed i nformati on of of been di rec tl y s ol uti on poi nts , tt,ligq'g111-1t /fl'ro \ it has hac has harcrininry ni ng bargai ei ther bargai ni ng aFp-l i c .rti ons rr;lnl bargai ni ng, di s agreement (I9A 2) r.rado w age over and let the new with an ',,;a1' the a g re e me n t , J b ut th e se co sts would be consider ably s m al - l er than the c os ts to i n cu rre d d u ri n q f- his situation would f eav e the uni on a in as L .a rc;a i n a tn d i r-\.- f,:,: .rl .- i1e { ' ir m f l te usually would be on}y too happy to assum ed reached. pr evious contr act' s wag es . T hus to i- o use a str ike or tv pe another of to For utj "l i ty l ; l sh An o r,:l e r in put to pr essur :e point i n p o r.ta n t on to firm pr esent the of the c i fer pa per a the wh ether on b ar:q :i n i n c-; t- o mo del- . f n ca]l- a str ike fact this shou l d can be un i on' i nc or por ated done be by in v er y a of p ro p o sa l , th e f or union p e ri o d , one Rubinstein- m odel. the assum ed is unti- I the eac h Aft er to pr oposal- next not or si mil- ar co n cl r.r-de h o t;e ve r m odelthat used is ther e ar e in only a t-hat wh o l e i nter val. stri ke a <rr hr r - r m o M or e with nor f onl- a ( 1988) Ha l - l - er .1 oarr i l i hri in r eal bar a r-n tn of model th e f ir m has u, : fi rm and the union O if t he n li e [0 ,1 ], b o th the fir mr s get thei r future For s hares . there is a s tri k e to hav e l i near repres ented the peri od in agreernent is the di s c ount H al - l er the by uni on thi s is u. : t, Wo if there is to and u. = W i f be reac hed, an 6 is reac hed. fac tor. the H al l er tim e m ay does be fi rm 1- ev e1s , c orres pondi -ngty @ U = at:r6t.t,, m ent,i c n not w e hav e does s us tai ned as a w here v, is no stri k e ^n ^c rrFement O if there is a s tri k e peri od in Vt : t, 1-W o i f there rrm is the following. In per i od eac h of and peri o d, a value added of one of uni t ,i c J oor l can divide them - between 'l 'hr ' ,ur i on':; shar e is l- W . If ( ,r l l :: tl r r .r r ni ( ) n zer o .in that 1r or io,l , lrrrl il i :: an is agreement y et has to be reac hed, and v, :1-l { reac hed. are gi v e as s umed to and w i thout l os s gi eneral i ty of one offer al ternatel y , offers the fi rrn as s umed is to nor m al an offer peri od in 1. The uni on c an then ac c ept or rej ec t it rej ec ts thi s '^'l r j , l r ff the uni on the ac c epts , bargai ni ng ends , if the :;l r ,r r r hav e to dec i de w hether to s tri k e in peri od. thi s If the ,r :r t r i fr t', fj -rm's p a rti es be y et un-i on w i ll is c an has offer. t he pay offs and an agreement gi ve p r o d u cti o n thei r no stri ke m odel- the as s umed s tr i k e to per se tu p are 6 t -1 u , , t The parti es T he parti es a i f ' I he is a new agreernent #-1 u-l the of w age equi l i br i um impor tantly, length unti l 6 (2) not and thi s gi v en. is two di v i s i on both so s um of [J = For ve ry A c ontrac t), natur af r ei ec ti on w hether deci- de s i mpJ -i c i ty , s vrhere c xt-e n si cn prev ai l i ng be the func ti ons , ( 1) : l e ci sro n prev i ous the in uni on' s the v ,,ag.,. hi gher t,hat is w age l ev el Ini ti al Iy r i ,r l i r r c l u:;t di scounted a cj --i o n peri ods . l ater rl 1r ,1- l|11 uni on the in I ( .r bl r be added w eal .: is p o :: i ti o n v al ue j -s W o > O (the share Cl e a rl y, the affect str ike. a o ffer is rej ec ted the uni on gi v es a ne\d offer in the nex t ,r :',:;r r m c c l not. peri od, w hi c h the fi rm ac c epts or rej ec ts . If the uni on' s offer is 5 6 ac c e p t e d to strike turn ga m e e n d s, the in n nr Fnn. r - p e r io d , th i- s give to if an o ffe r , it is and r e je cte d the i- n th e n e xt Bo th p a r ti es e tc. uni on peri od deci de it are is w hether the assumed fi -rn's to have The w age q tr i pay off tota] out c ome ko W is of the agreed (v i ew ed uni on upon peri od in peri od from s, after 1) s -l if the peri ods of i < i h€^r hat ion. The s t r u c t ur e of th e g a m e is illu str ated in Fi gure 1 befow , O t ',' h e r e t i r e gl v e n a n d th e fir r n ' s one peri od r e sp e ctive payoffs are (3) us(w) : x 6t w: :6 '- tu ( w ) 6 "" w /( r - 6 ) foral l -s > 0. t _L-5-t - p a r e n t h e sis. in L -r or t r o unionrs For I the fi rm, w e hav e c orres pondi ngl y Period: 1 p r o p o se fir m : oo W, (4) \, union: v,(w) : (1-w ) 6t r :5s -1 (1-w )/(r-6): s > 0. d' -1v (w ) , foratr +-L-5-a accept/r ele c l i u /\ g a m e e n d s, ( w1 1 - w1 ) ' uni on: stri ke/no (0, o) a/ u n io n : !f r r liL Lr .m . p r o p o se \,, : cvnuosnI Jt L / / q / r o! E i Jcu L a r f Dor nari nA pa r e n t h e s i s . n:rz6f f fOf the UniOn is equi l i bri um in ev ery p r o p o se and (o, o) strike (w0,1-wo) w3' the f! rrrti(/ rm _ resner-t jrro L r' / e rj , lr_. IN thi s proc eedi ng it is games exogenous. One j -s the ori gi nal _ assumed s tri k e ev ery The uni que perfec t S haked S utton, gi ven a nd by in the thi s game. of c ons ti tute Our aj -m i s thi s a N as h to fi nd c onv enj _ent to i nv es ti gate s tri k e dec i s i on is uni on R ubi ns tei n-game, peri od equi l i bri un 1984), of w hi c h I975) a game. in di fferent to s trategi es of s ubgame w here (S el ten, equi l i bri urn a pai r equi l i bri um B efore strike/no L/ fir m : game perfect union: perfec t bargai ni ng v ( W2 ,1 - Wz) (s ubgarne) A (w 0,l -w o) W, ,/ g a m e e n d s, stri ke unti t outc ome w hen the fi rm tak en w here the an agreement is w f (c f. gi v es R ubi ns tei n, the fi rs t tw o uni on as is reac hed. l ^982, or offer, is = U , (rr" ) u 2 ( w' ) (.) w" € = \', ( ru'") [0,1] w here \' l( wr ) w ere W' i s the give to the The uni que , , , 'lr c r e r , . ' . ' i s ,,.;cre to thc give p e r fe ct u n iq u e Lhe fir st ca n I . ir c r e r share'-han .,::-ike onIl-after 111.i-p cf r '. il in .:,""gqYu. rejecting the This rru / lonai- h th e nf its o r ig in a l str ike o ffe r s ve r y a n d not aca la r g e r sim ila r h:rcrinina deci si on Ru b in s tei n-game. :drranf lrr to th an the costs l-he By cal l i nc; fi rmrs, the make of assumpti on afl-ar obtai n the WilI 'fhiS th e norinrl\ after to th a n ) . .:t:1 ' J, a fter 6 i ..'o s an The unique unio n t-ir'- is air r eq the advantacr c p e r fe ct a s s L r m e d to f ho firqt which, flr r nr s, fO the nffar o n ly t +r a iq dS by noted airron thi s is that the in every thc costr : l{ o + (r) nrannqal Bi nm or e in vz(t\j ') v3( wr ) is ( 1 +6 w o )/e ,+6 ) Wu : et a1 hr; and w hen the U2 ( liu ) period other l ength of fol l ow i ng [0,1] the Thi s s urpl us is from w here how ev er the not uni on eac h peri od al s o c omment on the i -s as s umed W t, N ote reac hed (1-w o) , so i . e. in the the uni on s tr j ,k e ev ery an agreement. as s umed is be s ma1l . c as e w here to parti c ul arl y attrac ti v e, to ev er rec ei v i ng on agreement reac hi ng v ery is ( 1-w t ) / (r-6) to i denti c al - i mmedi ate frorn that s trategy . no agreement pay off the is an i bri urn if fi rm prov ed al s o is by any s tri k e c an ac hi ev e to it f Thus w hen the in s hal -l s tri k es s uc h di s rupted the are al l ow e d. In games both there bargai ni ng model - how ev er, +- l urr ,, h^; is abov e, exogenous, per fec t w '€ equi l w here appendi x , (1-w 0) /(L-62), w hofe the An iq pay off reac hi ng from the uni on peri od. other game, v/here the thi s o wn proposal -s, wt, = (7) to in the garfte i s extracts ti me the bes t total thi s r i ^ .,^ e^1,ar ua^ .i U, (I'Jr ) s ol uti on gi v en is th e payoff not o u tco me a fte r proof rej ecti ng that rrnianlq The cr UniOn. e q u ilib r iu m str ike uni on offer. ( w o +6 ) /( L +6 ) , w?: a \ - *, , Y t J 9 ! 4 v g / l a r qe r the if uni on I/ Q+ 6 ) o r ^ ' n p r o p o sa ls, u n io n ts is the fi rs t outc ome equi l i bri um is u se q.1-rateoir-al a + -h c f i - r n ' s . rJnl h o we ve r its cret if (B ) (5) to w" : union outcome o ffe r . T h e l i n . i c l u e so lu tlo n The e q u ilib r iu m perfec t uni que . , , -J e l -1 e d , e q u i l i b ri a , w here a uni que it and s t ri k e s In equi l i bri um. the c hoi c e of c al l i ng out to an inf ma y aLso occur in be is dec i s i on s tri k e perfec t w here t u rn s the inite tak en the as ri c her a s tri k e is n u mb e r of e q u i l i b ri u m. 10 I)r^ n^c i I i nn 1 will rece i v e peri ods. aLt for l V .e T h e s t r u ctu r e Pr o o f : ot an ) \i , then in the the of su b g a m e . strategi es in itia l th e is T h is done is offer or dow n to fo r ce d in that if acceptance ot such is one of ( u n io n a ll u!!gr ^rc^- ' t sr Ilnion: o f fe r I{0, Di s r , r p t e d r e je ct a ccept Wo, accept ( fir n is a l- l- l{ 1 Wf, ! { u, r e je ct p e r io d s alf uni on w i fl c hoos e uni on ac c epts the nronoses. In al l forced ( i.e . a cce p t p e r io d s, odd-numbered u n til W t W 0, nev er dow n to al l - fact by al l in in the the wh o no-strike enrri lihrirr-n in is th e e q u ilib r iu r ,r , d e via te s eq u i J - i b r i u m ) f rr. p l a ye r where u n io n th e fr o r n th e this a d va n tageous e q u ilib r iu m is nl^vpr in to s tr a t e g y the morc firm than u s f i r st is can in ve stig a te c l ea r ly r ece ive Wn. As fo r n o - str ike As lo n g 1 - Wn fo r e ve r , th e u n io n , if it uni on s tri k e w hether the Iev el uni on unl on nev er ac c epts demand W u. Thus , al w ay s as the thus W n.3 the it W e then to as the arbi trary w age l ater c annot hav e to after the fi rm a hi gher ac hi ev e s how that is it ow n propos al s , i ts in and If by is i ts el f, Wr in and uni on the c l -earl y it s tri k es will al l l ater mc re than peri od in peri ods , a pay off the totaL if t pay off z ero rec ei v e t, the ev en, in the pay off of uni on fai l s ds equi l i bri um will it and rec ei v e f or the uni on be then pay off a total to forc ed s tri k e of to dow n W s / (1-6). it Thus ow n propos al -s . after no-s tri k e the w i l -l be S i mi l ari l y , the un' i on does s tri k e not in peri od stri l .r' by the one sw i tch f i rm, it will- rec ei v e t, t pay off a total odd, of af ter a propos a' l W o + 6l I"/ (1-6) . Thi s t.o is more t han the pay off by c al l i ng a s tri k e, 6rtl o/(1-6), henc e the nttnish.ed. th e o p tim a l. offer Thi s stri ke, uni on Let the s tri k e, c urrent, fac t, w hat al -l - fi rm (the di srupted strategy, it agreement. fi rmts . an 6\r / (1-6). it the and not the equi l i bri um, fater for does in that W0 in no reached. posi ti on W f, l es s W r i mmedi atel y , peri od opti mal If not offer the fo1 Low i ng uni on), is agreement after currcnt stri ke the any is is, It W 0, or s tri k e bel ow credibl e not 1-w r): In/ ) w f, di s rupted offer by it as if if i nc Ludi ng s tri k e. rej ec ts and s tr i k c . al -l - W < w u. p r o p osal s a fte r w S w o' the pay off peri ods , to or peri od, that the al l not l ong in than W n, i n as w el l payoff al l as w age any Wn): dow n to fo r ce d a l- l- W > Wu a n d a ccept r e je ct ev e n - n u m b e r e d in W . e q u ilib r iu m l{r, offer is W > Wo a n d aIl- r eject strike offer get tw o fol l ow i ng the l es s then payof I mi ni mum hi s Thi -s i s uni on ni ght e q u i l i b r ju m I f i L[r' ' .- ' s tr i k e p la ye r d evia tin g I un l . o n : e q u i- Ij- b r iu m fr o m parti ti on.2 e q u i ti bri um e q u i l i b r ia . fo-5tri}.e F'irm: th e d e via te folfowing t yp : e s of p l a y er s the a p e r fe ct w* is W t], [\i .., pay off z ey o as equi ti bri um. the uni on The fi rn's never will ar:cent not s tri k e Wf i mmedi ate' l w . propos al s after othc rw i s e it wil, by the fi rrn. be forc ed The uni on dow n to w i l -l W^ in the stri l :cl , f ol l ov,ri ng to a n d there is no need st ri kes in arry peri od s ubgame. offer: We n ow hav e t, t: peri od, and that to thi s s how that offer will the fi rm w i l -I be ac c epted. offer If W. in the fi rm the fi rs t does not L2 11 oIfer i {, I i r m's th e b e st c l ea rl y a n -l is to the fir m a p e ri o d , the n o -stri ke J i r r u p tcd n e xt union re j ect the than and the be]ow offer i ng will- if an fai l s in w 'i n l e ve l s I Irat Cl ear ly, ]e ss tva l e th a n gives fi rm wiff as above above it never can be offer ) s uppor ted is , as the bel ow thi s per fec t pr ov ed uni on the in str ikes \ r ' d e e I e ve l 1 ol I o v r s d i r e c t l y ori g i n a l an upper this uni o n strikes pro o f that pro o f for in this the th e w' in nr r qqihle. part of o n p la ye r in [6w r, j br i a e q u ilib r iu m p e r fe ctn e ss of th e r :annnt equi ti bri un. for u or - f Ys of (1984) If the payoff of an su b g a m e R emark agreement perfect d isr u p te d stri ke is is reachecl . si mi l ar equi l i bri um to s i tuati on not is thi s the a uni on Thus , is get will pay off the peri od nex t c al l i ng 6W 6/ (1-6). the it the i ts dow n to forc ed s tri k e di s rupted the pay off of s tri k e di s rupted thi s the uni on will gi v e will a l ev el do total break s equi l i bri urn mi ni mum s ee by offer a total a H ow ev er, bec aus e w o. To al s o an mos t at from on. s tri k e, is rej ec ts fi rrn If more. equi l i bri um the if s tri k es , uni on W o. the 4 A po s s i bLe the w hi ch w here the from by perfec t uni que get uni on as the equi l i bri um and c annot l es s the as , better is abl e then eqU i l i bri um, as be s upported c oul d L proof The uni queness Sh a ked and S utton a q tr lke u n ti] is p r oof r r ni on w t], perfec t uni que the any thi ng ac c ept equi l i bri um appendi x . wo is con s i der S w /r (1-6) l - ev el . p a yo ff. 2's p e r io d p e r fe ct th e o n e co u l- d d e fin e e ve r y fhe LeLe, any m o d e l- cffe r e d bound c a se not ar e th a n fr o m R u b i n s t ein In w0 e uni on. to equi l neve r dow n and cl j q rrrn te d a lrigher wo 2 w r, will thi s, per fec t as for for c ed suppor te d be fir st be o pti m al be never iJr cannot the W' cannot _2_ Tf pu t s it W n, L e ve l s ( ' . ..-h e n t.h e R e na rk h]n or onJ -y c hange 3 rf below and the l w o, w r]. to s hri nk for 1, w hi c h w age l ev el s of w oul d equi l i bri a R emark the QED e c l u i l i b ri a . a c ce p t perfect range the be that propos i ti on in equi l i bri un the s ubs ti tuted the R e n a rl l Wa g e s tri k e be c an equi J -i bri um s tri k e The tr r 'n, c as e on w oul d so do omi tt ed. thus di srupted the onl y thi s aqr eem ent rn to r ec ei v es bec aus e ensur e t}r c w hi c h w '. it uni on wr T hen, per i od, nex t w* bec aus e foll- ows pr oposal fol - l - ow s . in payoff accept equilibr ium p e ri o d . W" fower witl any stri ke equilibr ium accept equilibr ium rvi I I it str ike o ption g j -ve s first Lhe disr upted to thi s agreement of ex tens i on c ommi t i ts eLf in s tri k e w i -Il - l as t is stri ke reac hed. s tops The the the i tsel f woul d and stri ke w i thout w i thi n the hav i ng s ens e f or thi s i rnrnedi atel y ) c apture model . i s the pos s i bl e reac hed . l eas t ti me (i f c os ts to > 1 peri ods , an agreement is if no reac hed, opti on of c ommi tti nc -1 uni on of s toppi ng the an agreement. a s tri k e, s tarts it s uni on I s The uni on fotJ -ow i ng. if that at The the It is tri v i al to a s hc ,' * L4 13 that o p t i on this pe r f e c t than wo u l- d ( th e equilibria Wn would i t s e l f, "oor*itt"a be Wn in l- o wer part th r e a t n e ver to accept or b ecause w hen the cr e d ib le , p r o fit wo u L d fir m th e than wage leve} fir n r s lo n g e r no th e r e m o ve order sto p to from the of lrsp-a-Ei.!j-an-2 any there is a discount is the where exi s t s on reached Proof: T h e e q u ilib r iu m pl a y e r has pe r i o d s , in offer proof firm in any of a ll- l ength goes real to zero- as but devi ate in 1 - if ex i s t for \ 6N 11-w .)/(r-6) to equi v al -ent (l -w r)/6n. s tri c t l es s any c ond.i ti ons peri od. l ater the in dev i ates w o,/( 1-6 ) . Thus ti me, in t imirar Thus (9) the uni on bound upper the determi nes to not fi rm the pay off fi rs t the to peri od by ac c epti ng will not dev i ate uni on pay off W o, i ts uni on bc will 2 !l n/ (1-6) 6uv l "/(1-6) if the If A N w -7(1-6). is , or as l ong (10) no w - > w ol 6N W ( accept W > w* and W*, r e je ct e ve n - n u m b e r e d p e r iods, al L W < w *. W 2 w f, W < w * and a ll S Wo i n accept al -I Wf, a cce pt al -l - w no stri ke in peri od, not stri ke, and accept The same c ondi ti on N th e e q u i J .ib r iu m giving in to bound atl al -l p la ye r s th e d e via te s, th is p la ye r fo ]lo ws. p a yo ff to fir m th e fir st th e f ir m th e p e r io d , th e to ta l th e subgame A is 5N 11-w ")/(r-6) d isrupted p a yo f f (1-w 0) stri ke - rf the goes N is now al s o = any l ater s how that the w hen the t he to l ength z ero, cons tant N i ncreas es , equi l i bri um + 6 (r-w u) / G-6) l\ s tri c t fes s Thus in ex i s t c ondi ti ons peri od. s tri k e to not uni on (10) for determi nes the fi rs t the uni on the l -ow er on w . D enote the but in d ev i ate we odd- in descri bed and s i mi l ar the for appl i es * ti me, p un ish in g deviates follows, an agreement p e r i o ds. above The o ffe r th e n a l- l r e je ct a ll Wu , r e je ct ! ^ J> W * , s t r i k e rf w", o ffe r N periods, numbered w hereupon fol l ow i ng, the > wo a nd w a lI W0 , r e je ct then Union: are str a te g ie s w* < equi J -i bri um equj -l i bri un peri od b a r g a in in g e a ch dev i ate onw . l, a perfect a h a ve ca n is not will d e v ia te d . offer Firrn: str ike s of } e n g th that (1-w r)/6N 1 - w 0l 6N , I N p e r io ds, in str ike s u n io n w* e a ll- 6 < l- su ch fa cto r W*. T h e se when the al s o N > o and i n te g e r , w hi c h fi rm I I I ., For the I stri ke). th e / (\-6) (9) hi gher a Thus has uni on accepti ng (l -w r) more offer (r -6). (1-w r)/ of range I w 0,/6N , 1 - w e l et and 6 is of tength of eac h N i nc reas e adj us ted ] has aw ay hav e c an peri od s o that from z ero. the goes s o that QE D Lo z era. w hen } i mi t the of l ength as A l ength. goes the reaf in l ength In A c orres pondi ngl y , a pos i ti v e a peri od bargai ni ng eac h bargai ni ng bounded (1-w r)/6N s tri k e the to the s tri k e z ero i nterv al and t_ 5 Rem a r k 5 C onc l udi nc l There del a y of without this type a tso a n in fin ite s tr ike b e fo r e of n periods, f or in is th e e q u ilib r ia is with o u t proposition the number any a b o ve of is agreement th e The parti es th e n sta r ts. actuaf equi l i bri um puni shed is devi ati on An y As negoti ate perfect the is there The structure reached. fo llo win g . str ike s, w here equi l -i bri a as abo v e . 6 ( l- 9 8 8 ) Rubinstein per f e c t to describes su b g a m e , following do. This mo r e intuitive. will never mo r e than t he t ha t bc optimal tn fact rea c h e d , if e xa m p le , forced th e fir r n fir m fu tu r e , th e W o w h a te ve r th e u n io n may do. to th e profitabte to a str ike . ca ll- str ike to fo r th e p r e ve n t th e wh e r e Bo th u n io n p a r tie s th e p a r tie s d o w n to i- ts m in im u m h a ve is im m e d iatel y. to from o ccu r outc ome B i nmore, 1987) , sh o ws p a vo ff sig n . In thi s of by w eakness, si gnal thi s jt N ote, eredi bi l i ty is fol l ow i ng enduri ng partl ' a need ex tens i v el y for a s oc i al - about will k i nd to of thc thi s (c f. l -i terature One mi ght i s s ue, prov i de not threat c onv enti on w hat ans w er a more bas i c s tri k e a uni on the mod.ef, c onc epts . refl ec ts pres ent the e.g. in new equi l i bri um w hether pl ay ers i nterpretati -on v /age rev er a w age un i on' s r",echani ca l is ri k e the one pos s i bJ -e i ndetermi nac y determi ne the Thus / the used. will thi s moder One pos s i bl e if for to dev el op in is w hi c h enouc l h c redi bl -e. may ac t as c an be equi l i bri um expected. offer it thi s a fai ra. changi ng. strength is uni on an agreenent the Thus, that bel i eves case to equi l i bri a i ndetermi nate. to that i nformati on of been purs ued is abs trac t there l -eft has a rgue an a mul ti pl i c i ty is w hi c h hi m opti mal f i rm c an be gi ven sh ow to to reached, unti ] str ike b e lie ve s str ike s of one in it the if the reason no makes a n a g r e ernent g ive fir m ' s Thi s Sim il- a r ily, u n til fir m has in equi l i bri a that bel i eves do expects vari ous r n a k e the th e int e r p r e t a t i o n . is to pl aver a after w ou1d hi msel f other th e in strike for If but strategy p layer th e wh a t For T h e e q u i l - i b r iu m strike. a lso h e lp s u n j - o n will the wh a t of i nterpretati on p la yerrs A i n t e r p r e ta tio n not union o n ly not fo llo w i ng th e str a te g ie s. equilibrium devi a t i o n o ffe r s is probl em, that t he t here how ever Rem a r k c o mme n t s s tri k e is c ons i dered offer that appl i c ati on of s tri k e the by bel -ow w * w i l l threat how ev er, of of is thi s the threats to equi l i bri um one be or remai n c redi bl -e is is bargai ni ng tak en for at to unfarr, it s ol uti on granted. W' is pray ers both c ons i dered i nterpretati on N as h outc ome has odds be anc l to w i th w here be a ttrc 1B A ppendi x w e now !!!l!919! * u ' r c r r L vnf L no- ^ I 'n n nu n mr lu .lui Jn o cs, T T .ce u n ive r sity r t m anl- I ' lic h a e l Hoel an d t o Abhinay for d iscu ssio n s Mu th o o a n d Ar ie l s ug g e s t i o n s o n a n e a r ]ie r f or E c o n o m ics, Labour c hr i s t i a n i a B an k f ln a n c i a l f or n a t i o n t hc The of I fo r paper o r i gi nal am gratefuf r i dea for part of and the sAF ce n te r Un ive r sity of to to paper, comments the and the to A ppl i ed and C entre N A V F, ESRC proj ect rej ect for thi s to hospi tari ty, le g a t to hel ,pful grateful a m a lso th e ir is at Eco n o m ics, osl -o. Ru b in ste in Kr e d itka sse s a n d u n e m p lo ym e n t' r Department th e d r a ft. L SE, og s u p p or t. about of hi ghest (1984) wish aftpr to thank harlinrr -ead Ar ie l a fir st Ru b in ste r n d r a ft fo r rn the payoff of at starti ng paper the be w i tl 'r assume wn < 6 wf, that th e a fte r n a tive is di scussed the absence of any pure n e g o tia tio n is not to sa y th a t th e fir m wo u ld bel ow . w hat costs. not prefer a Low er fi rm rn' order one offered ori gi nal gi v es w hi c h to in do thi s , S hak ed of the the w e us e and R ubi ns tei n-game. s trateqy proof the N ote to 14/ (L-6) . that the total the S utton N ote uni on is rej ects t hi s rncst offer that tak en fi rm not s tri k e than the fi rm's share the the as I/ (I-6) the and w hi l e if at l -eas t is t1 - offer it rej ec ts . Thus w 0(1-6) 2, and the 6t[/ (1-6), if l eas t that the any of f er s upremum of (1-6M) /(r-6) 2 is 1 thi s peri od offer, of the (rec al ] that ) . s trj _k es , thi s D enote re j ec t , i mpty i ng peri od fi rmrs it at c ertai nl y pay off in thi s of peri od in in the s ubgames i nfi mum s tarti ng get to the 3. a pay off w i l -l will the rej ec ts reas t fi rm of peri od in fi rm at f i rm s rnal -l er is the get will- c an rec ei v e offer rf ri mi t egui ri bri um, s ubgame w o + 6 (1-6M) / (r-6) gl vi ng perfec t the H enc e 6(1-5M),/(r-6), thus N ow c ons i der l Jow c ons i der w age. i denti c aL, get uni on. an upper s truc tures c an the pay off the any one w e deri v e it . uni on 3 are in 9et, by the does f ess 1 and c an equal 1-h.'o*6M/ (r-6) the 4. T h i s peri od stri k es , gi vi ng 3. I n the of uni on. an o ffer uni on m y p a per. uni on. the s tri k e part the in t.he uni on 2 -r in the fi rs t of share thrs to 'w age R esearch me to the equi l i bri um exogenous . for Osl _o. r eferri ng to uni quenes s perfec t the s i mi l ar anal y s i s , i nfi mum I fi nd pay off v ery fo r thi s must 1. to pos s i bl e an argume nt in try the } atter - peri od in will rec ei v e w i thout uni on 1. at s tri k i ng w i .rl - pay off, 6(1-6M))/(r-6), rf w hi c h uni on mos t it c ertai nry S o the the rec ei v es at ac c ept any i nfi mum equars of the 20 M/ ( r - 6 ) . Setting M - (A 1 ) - wn ( 1 - 6 ) 1 - 6(r_-6M), M / ( t- - 6) A s abov e, ( A3) M: Thus we o b t a i n ( 1- wo) / ( r + 6) M: (A 2 ) t_ - M = and ( 6 +w n) / (r+6) perfect the uni on ( 6 + w o )/ ( I + 5 ) de r i v e d in th e a p e r fe ct in can obtain is the ca se upper lim it e q u ilib r iu m wh e r e fo r u n io n th e the to w age uni on onl v w as It strategy. a ny stri ke stri kes the fevel after ow n i ts pro p o s a l s . W e n o w s h ow th a t t he to can obtain 'l f nor ind r v q Pgr t he unj-on 51 4 /( I - 5 ) pa y o f f at , if fir m it e xp e cts c on sj- d e r offe r str ike s, wiII th e if t1 - it in p e r io d th e fir m r s with o u t pla n s w n ( 1 -6 ) not - th e u n io n a th u s to to in fho fir m str ike . i-hp get Thus the the starti ng a ffo r hv most at offer an si mi l ar share the roiar-l-q will l -evel - by very is subgames the fi r m a cc ept ce r ta in ly W o + 6 ( 1 - 6M ) /( I- 6 ) , pa y o f f ;f w age supremum of th e e q u ilib r iu m ) -, thi s T h e argument n o w d e n o te s norinrl rvu l,E! u n io n the this re j e c t s |. th e rTrnr so We then most ? get in d e ed a b o ve , a n y p e r fe ct ( 1 - 6 M ) / ( I- 6 ) ]east lea s t r ndu qlr and d e scr ib e d in ca n u n io n M/ (1-6) o n e a b o v e. the f ir m 'in I rr s t r a te g y strike th e gi vi ng uni on thi s get will 2. p r o p o sa lthe str ike , th e str ike . 6 ( 1 - 5 M ) l/( L - 6 ) , in peri od uni on will not T h e r e fore the u n io n wh ich equal s 1. If will accept fi rm the uni -on at recei ve any can l "ow er get at is the equi fi bri um, c an ow n propos al s , Thus y i el ds (1-w o)/(r+ 5) (6+w 0)/(r+ 6) any thi s i ndeed but not hi ghes t w hen the get thi s after ( 6 +w o ) /( r +6 ) 1-M: and w age fi rm w age the ]ev ef gi v es l -ev el - fi rrnrs . if the the it eE D uni on fi rs t s tri k es c an ger offer, after l -n and 2I CENTRE FOR I.ABOUR ECONOMICS Re f e r e n c e s Blnmore, (1987). K.G. P h i f o s o p h y, 3, K. G. , Binmore, of Haj-ler, H. paper, BB-09-02, A. Rubinstein, theory. Selten, R. A. Shaked, sta te (1988). (1985). perfect and b a r g a in in g as p o in ts 4, e q u ilib r iu m a The R and game. strategi c V i rgi ni a o f Eco n omi cs, The in e q u ilib r iu r n on in th e e xte n sive th e perfectness g a mes. Internati onal (1984). in In vo l untary a b a r g a in in g model . +L^ ^f pol ytechni c model . of concept game E conometri ca, 1 ^l ffom Centfe fof S t re e t , London, L a b o u r E c o n o mi c s , WC2A 2AE.) N o.303 w . B U ITE R Can Public N o.304 C. PISSARIDES U n e mp l o y me n t a n d Ma c ro e c o n o mi c s : I n a u g u ra l L e c t u re N o.305 S. I L MA K U N N A S AND S . P U D N E Y A Mo d e l o f Fe ma l e L a b o u r S u p p l y P re s e n c e o f H o u rs R e s t ri c t i o n s in N o.306 W. B U I TE R A Viable Mo n e t a ry Fl e x i b l e N o.307 D . B I -A N C H FL O W E R AND A. OSWALD Th e D e re rmi n a ri o n N o.308 R. IAYARD AND S. N I C K E L L I s U n e mp l o y me n c L o w e r O v e r E mp l o y me n c ? N o.3O 9 R. R, D o e s L o n g -Te rm U n e mp l o y me n t R e d u c e a P e rs o n ' s C h a n c e o f a J o b ? : A Ti me -s e ri e s Te s t No . 310 R. JACKI,IAN, R. I^AYARD AND S. S A V O U R I J A C K MA N A N D IAYARD I ^ I a g e s a n d P ri v a t e Spending Cuts f n f o rma t i o n be I n f l a t i o n a ry ? as a G o I d S t a n d a rd R e q u i re s a n d Fi s e a l Policy of W h i t e -C o l l a r if Unions An rh e pay B a rg a i n IDETAYEDI N o.311 S. W A D H I i A N I A N D M. WALL Th e E f f e c t s o f P ro f i r-S h a ri n g o n E mp l o y me n r, W a g e s , S t o c k R e t u rn s a n d P ro d u c t i v i t y : E v i d e n c e f rc m U K Mi c ro -D a t a N o.3l 2 W. B U I TE R S o me Th o u g h c s in Stabilisation in Developing N o.313 s . w A D H w A -N rA N D M. I{ALL A D i re c t Te s t o f t h e U s i n g U K Mi c ro -D a t a N o.314 D . ME TC A L F l^Iater Notes N o . 315 l ^J . B U I TE R D e b t N e u t ra l i t y , R e d i s t ri b u t i o n and C o n s u me r H e t e ro g e n e i t y : A S u rv e y a n d S o me Extensions. Also, D e b t N e u t ra l i t y , P ro f e s s o r V i c k re y a n d H e n ry G e o rg e ' s Ta x " "Single N o.3l 6 S. E S TR I N A N D D. JONES C a n E mp l o y e e for Journal unempl oyment ^ --^ i S t ri k e s , 52, t _ 35 1 - l _ 3 6 4 . I ^ .-^ S. Mc C O N N E L L 25-55. J. v ! u rrc s c p a p e f s a f e a w a i l a b l e Sc h o o l o f E c o n o mi c s , Houghton N o.302 88/I8I. , of ^^ I,Jorki ng a bargai ni ng j -nterpretati on a^^: \v v pr s s London Journaf 9 1 - IO9 . Co m m e n ts / N ash u n ive r sity. Re - e xa m in a tio n Su tto n , ( 1986) . A. m odel l i ng. e co n o m ic Pe r fe ct 50, G a m e Th e o r v, A. Wo linsky, ST ICERD Discu ssi equi-librium of , and De p a r tm e n t (1982). E c o n o m e t r i ca in wa g e and and 176-188. 17, (1988). institute Rublnstein, A. so lu tio n E c o n o mics, E conomi cs I7 9 - 2 1 - 4 . Ru b j- n ste in , bargaining pl ayers. r a tio n a l M o d e L lin g o n t h e R o I e o f Fi s c a l Policy a n d S t ru c t u ra l A d j u s t me n t C o u n t ri e s Efficiency w a g e Mo d e l D ry U p O w n e d Fi rms S u rv i v e ? On- The- Job N o .3 1 8 S. J. E S T RIN AND S V E JNAR Estimates of Static W age Deter m ination N o .3 1 9 D. A. M. B IA N CHFLOW ER, OSWALD AND GARRETT Insider N o .3 2 0 D . ME T C ALF Tr ade Unions and Ec onom i c Evidence Br itish N o .3 2 1 R . I-A Y A RD AND C. BEAN l^lhy Does Unemploym ent N o .3 2 2 A. J. Styli- sed N o.3 2 4 N o.3 2 5 N o.3 2 6 N E WE LL AND S Y MONS in Power Facts D . B U .NCHFLOWER AND A. OSI,IALD The Econom ic Unions D. R OB E RTSONAND J. S Y MONS The Occupacional Childr en A. S. B E N-NER AND E S T RIN Unions Ver sus N o.336 W. B E N TL E Y MA C L E O D L a b o u r Tu rn o v e r and.the AND J . MA L C O MS O N U n e mp l o y me n t : Efficiency Unemployment N o.337 W. B E N TL E Y MA C L E O D W a g e P re mi u ms a n d P ro f i t AND J . ' MA L C O MS O N Efficiency \ ^ I a g e Mo d e l s N o.3i 8 G. B R L TN E L L O W a g e D e t e rmi n a t i o n i n a S i mp l e Mo d e l w i t h a N o n z e ro P ro b a b i l i t y P ro mo t i o n N o.339 D . B L A N C H FL O W E R N, MILLWARD AND A. O S W A L D Unionization N o.340 D . B I -A N C H FL O W E R AND A. OSWALD Th e W a e e C u rv e No . 341 R. IAYARD AND R . J A C K MA N Th e R e a I P o l -i c i e s N o.342 A. Th re e S q u e e z e s : D e p re s s i o n s N o.343 R. I"AYARD AND S. N I C K E L L Th e Th a t c h e r N o.344 D. Fe a r, l J o.345 D . B I A N C H FL O W E R AND A. OSWALD L l a g e s a n d H o u s e P ri c e s : Evidence lTo . 346 R. ll,YARD Layoffs by Employment N o.347 J. A. S I ' } , I O N SA N D NEWELL Th e P a s s i n g U nem pl oy m ent N o.348 S. H O L D E N W a g e D ri f t Norway F our N o.349 S. H O L D E N N o n -C o o p e ra t i v e Wage D eter m i nati on Bust The Canadian R. of Effects Per for m anc e: of Ch oi c e of R. Review N o.3 2 9 M. MUL L INS AND S. WADHWANI The Effect Investment: of the Stoc k M ar k et on A Comparative Study N o.3 3 0 G. B RU NELLO Hyster esis Pr oblem' and N o.3 3 1 C . P IS S A RIDES AND R. MOGLIADAM Relative Countries N o .3 3 2 C . B E A N AND A. GAVOSTO and Capacity Shor tages Outsider s Kingdom Unemployment in the United N o .3 3 3 J. and Sear c h Unemploym ent Benefit s in the UK Labour Market N o .3 3 4 S . N ICK ELL AND S. WADHWANI WA D SWORTH Insider NEWELL of an Agi ng of Ins i der - B I -A N C H FL O ' v J E R W or k 1987/88 J apanes e Wage Flexib i l i ty For ces a n d E mp l o y me n t H i e ra rc h i a l of Behaviour Effeccs of Ta x -B a s e d I n c o me s Th e D e ma n d f o r Labour D u ri n g in Mi ra c l e ? F i r r ns No . 328 ' The in Ma x i mi z a t i o n Br i ti s h Unem ploym ent Conseq uenc es Population: An Appl i c ati on Outsider Theor y Year ' s N a t u ra l Rate of \ ^ l a g e v s Fri c t i o n a l T r ade Br i tai n's C. P IS S ARIDES the C o u n t ri e s P e rs p e c t i v e '82 U ni oni z ed and Pr oducciv i ty : Union M anaged F i r m s of W a g e Fo rma t i o n i n t h e N o rd i c V i e w e d f ro m a n I n t e rn a t i o n a l D em and C ur v e N o.3 2 7 I-AYARD T he Per s i s t? Labour J A C K MA N Ev i denc e and D y nam i c M odel s of Firms i n Labor - M anaged and the M. K E IL AND J. S Y MONS N o.335 Som e Em pi r i c al C , P IS S A RIDES AND J. I./ADSI^IORTH N o .3 2 3 I' Sear ch: N o .3 1 7 Effor t and l J age D eter m i nati on U n e mp l o y me n t S e n i o ri t y of the a n d P a y Fl e x i b i l i t y C ro s s -s e c t i o n a n d E q u i l i b ri u m Golden a n d B a rg a i n i n g : Age Evidence l , l a g e B a rg a i n i n g f ro m