When voting mechanisms substitute for the market mechanism in allocating resources, we are relying on

To produce 10 shirts, the total cost is $80; to produce 11 shirts, the total cost is $99. The marginal cost of the 11th shirt is equal to

A) $8. B) $9. C) $80. D) $99. E) $19.

The figure above shows the U.S. production function. From 1986 to 2008 the United States experienced major advances in technology as well as an increase in the working-age population. The combined effect can best be shown by a

A) movement from point W to point X. B) movement from point Y to point Z. C) movement from point Y to point X. D) movement from point W to point Z.