Microsoft was charged with violating the antitrust laws not because it had a virtual monopoly in the form of its Windows operating system, but because it acted like a monopolist in trying to control the market for certain software applications

The change in cost that results from a one-unit increase in output is called the

A) average fixed cost. B) per-unit variable cost. C) per-unit total cost. D) marginal cost. E) average cost change.

Before 1970, mutual funds invested almost solely in

A) corporate bonds. B) corporate common stocks. C) United States government bonds. D) municipal bonds and money market securities.