--**Front**: GDP per capita
**Back**: GDP divided by total population.
--**Front**: Purchasing power parity (PPP)
**Back**: Constructs the cost of a representative basket of commodities in each country to
compare income across countries.
--**Front**: GDP per worker
**Back**: GDP divided by the number of people in employment.
--**Front**: Productivity
**Back**: The value of goods and services a worker generates per hour of work.
--**Front**: One dollar a day per person poverty line
**Back**: A measure of absolute poverty used to compare poverty levels across countries.
--**Front**: Human capital
**Back**: Each person’s stock of skills used to produce economic output or value.
--**Front**: Physical capital
**Back**: Any good, such as machines and buildings, used for production.
--**Front**: Physical capital stock
**Back**: The value of equipment, structures, and other non-labor inputs used in production.
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**Front**: Technology
**Back**: A set of devices and practices that determine how efficiently labor and capital are
used in an economy.
--**Front**: Aggregate production function
**Back**: Describes the relationship between a nation’s aggregate GDP and its factors of
production.
--**Front**: Total efficiency units of labor
**Back**: The product of the total number of workers and the average human capital per worker.
--**Front**: Law of Diminishing Marginal Product
**Back**: The marginal contribution of a production factor to GDP diminishes as its quantity
increases, holding other factors constant.
--**Front**: Research and development (R&D)
**Back**: Activities aimed at improving knowledge, generating innovations, or applying
knowledge in production to enhance technology.
--**Front**: Efficiency of production
**Back**: The economy's ability to produce the maximum output from given production factors
and knowledge.