If the first copy cost of a music video is $223,000 and the marginal cost is $0, then as the firm produces an infinite quantity of the video, the average total cost of producing the video will approach:

What happens when a nation's currency depreciates?

(A) Its products become cheaper to other nations. (B) Its trade increases. (C) Its trade decreases. (D) Its products become more expensive to other nations.

Predicting business cycles is difficult because

A) they are very persistent. B) the weather changes unpredictably. C) statistics lie. D) their frequency is irregular.