A short-term debt instrument issued by well-known corporations is called

The table above lists the market shares of the twenty makers of personal computers. The four-firm concentration ratio tells us that

A) the four largest firms have 20 percent of the market. B) there are no barriers to entry in this market. C) the firms sell differentiated products. D) all firms sell identical products.

The assumption of wage and price flexibility lead classical economists to conclude that business cycle fluctuations are short-term in nature

a. True b. False Indicate whether the statement is true or false