B) demand and marginal revenue curves are more useful for analyzing oligopoly than
they are for analyzing perfect competition and monopolistic competition.
C) because oligopoly firms often react when other firms in their industry change their
prices, it is difficult to know what the oligopolist’s demand curve looks like.
D) the concentration ratios of oligopoly industries are lower than they are for perfectly
competitive and monopolistically competitive firms.
Suppose that the labor movement has a revival in the United States and the majority of
workers join labor unions. As a result we would expect
A) the labor force participation rate to fall.
B) the unemployment rate to fall.
C) the unemployment rate to rise.
D) no change in the unemployment rate or labor force participation rate.
In September 2012, the average price of gasoline in the United States was $3.91 per
gallon and consumers bought 5 percent less gasoline than they had during September
2011, when the average price was $3.66 per gallon. Based on these numbers, what was
the price elasticity of demand for gasoline from September 2011 to September 2012?
A) -0.33
B) -0.76
C) -2.96