The aggregate demand curve is the sum of all market demand curves in the economy.

At a perfectly competitive equilibrium with production and trade, the slope of the production possibility curve will be

A) equal to the slope of the price line faced by the consumers. B) steeper than the slope of the price line faced by consumers. C) flatter than the slope of the price line faced by consumers. D) either steeper or flatter than the price line faced by the consumers, depending upon the relative preferences of the consumers.

If the price of one input changes, the firm will change its use of that input only

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