Which of the following encourages people to engage in activities that yield uncertain returns?

One reason the aggregate demand curve is downward sloping is because of the

A) interest rate effect. B) tariff effect. C) welfare effect. D) price effect.

According to the above table, the marginal factor cost of the seventh worker is

A) $24.00. B) $126.00. C) $42.00. D) $168.00.