a. Tragedy of commons
b. Free rider problem
c. Diminishing marginal utility
d. Diseconomies of scale
e. Tax incidence
g. Gains from trade
h. Rent- seeking in monopoly
i. Public goods
2. a. If the price elasticity of supply for corn is 3.12, then is the supply of corn elastic or inelastic?
b. If the cross elasticity of demand between peanut butter and milk is -1.11, then are peanut butter and milk substitutes or complements?
c. The income elasticity of demand for movies in the United States is 3.41. If people's incomes decrease by 1 percent, what is the decrease in the quantity of movies demanded?