Comparative advantage is always a(n) ________ concept

Theoretically, in a long-run cost function:

a. all inputs are fixed b. all inputs are considered variable c. some inputs are always fixed d. capital and labor are always combined in fixed proportions e. b and d

The calculation of the poverty line includes adjustments for

a. energy costs. b. child care costs. c. the level of prices. d. the Earned Income Tax Credit.