Emissions permits allow polluters to pay for the right to pollute a specified amount.

The income elasticity of demand for food

A) does not change when an individual's income changes. B) increases as an individual's income increases. C) decreases as an individual's income increases. D) is negative.

Despite dramatic increases in trackage during the antebellum period, the U.S. was slow to develop an integrated railroad system. This was primarily due to

a. the opposition of municipal governments to railroads. b. the opposition of the federal government to railroads. c. the failure to adopt a standard gauge for track. d. heavy taxes on railroad companies.