Under what circumstances are the marginal expenditure for an input and the average expenditure always equal? Where there is a

________ decreases a firm's capital stock, and ________ increases its capital stock

A) Saving; depreciation B) Depreciation; investment C) Time; depreciation D) Saving; investment E) Investment; saving

In efficient markets, investment capital flows toward profit opportunities.

Answer the following statement true (T) or false (F)