The slope of marginal revenue curve is ?

A. always equal to one.
B. half as steep as the demand curve
C. the same as the slope of the demand curve
D. twice as steep as the demand curve

In which of the following circumstances would a cartel be most likely to work ?

A. The market for copper, where there are very few producers and the product is standardized.
B. The fast-food market where there are a large number of producers but the demand for fast food is inelastic
C. The coffee market where the product is standardized and there are a large number of coffee growers.
D. The automobile industry, where there are few producers but there is great product differentiation.

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