If both the market for a firm's output and the market in which it hires its labor are perfectly competitive, the firm's labor demand curve will be perfectly elastic

The sum of durable goods, nondurable goods, and services equals

A) investment. B) fixed investment. C) government purchases. D) consumption. E) net exports.

Increased optimism about the future will lead to

A. Less current investment and less future consumption B. More current investment and more future consumption C. More current investment and less future consumption D. Less current investment and more future consumption