Answer:
equal or greater than the marginal revenue product of capital
Explanation:
In a given situation where a firm is considering if and when to inject more capital investment into the business operation, such action usually rests on the positive or profitability of the marginal product of capital. Based on the neoclassical model, in a perfectly competitive market, firms will increase investment if the rental price is equal (equilibrium point) or greater than the cost of capital.
Hence, the correct answer is "equal or greater than the marginal revenue product of capital
