People who drive fuel-efficient vehicles tend to recycle more often than people who drive gas guzzlers. This is an example of

A. difference-in-differences.
B. correlation.
C. statistical significance.
D. causation.

Answer: B

Economics

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A market with few sellers, some influence over price, high barriers to entry, a differentiated product, and non-price competition is known as

A) perfect competition. B) monopolistic competition. C) oligopoly. D) monopoly.

Economics

Which of the following statements about perfect competition is true?

A. In the long run, the entry and exit of firms will generate normal profits for firms. B. In the short run, firms can only generate economic profits. C. In the long run, the entry and exit of firms will generate economic profits for firms. D. In the long run, the entry and exit of firms will generate losses for firms.

Economics