Consider the following 2x2 economy with individual 1 and individual 2,
where their preferences are;
For individual 1: u(C1, C2) = u(C1, C2)^0.5
For individual 2: u(C1, C2) = u(C1, C2)^0.5
Individual 1 is endowed with e1 = (2, 1) and individual 2 is endowed with e2 =
(1, 2).