For many years, AT&T required customers to rent telephones from AT&T in order to receive phone service. This is an example of:

In the long run, with an increase in the plant size, _____

A. the short-run average total cost curve shifts downward B. the long-run average cost curve slopes downward C. the short-run average total cost curve shifts downward if economies of scale exist D. the average total cost of production rises

"In the long run, we're all dead" was Keynes' way of saying that

A) intellectual pursuits, like understanding the economy, are unimportant in the scheme of things. B) no one would appreciate his theories during his lifetime. C) there is no point in saving for retirement. D) it is very important to save for one's retirement. E) none of the above