Question

Explain the neo-classical theory of investment.

Answer 1

The neo-classical theory of investment explains investment decisions based on the rate of interest and the marginal efficiency of capital (MEC). According to this theory, investment is determined by comparing the expected returns from capital (MEC) with the cost of borrowing (rate of interest). Entrepreneurs will invest as long as the MEC exceeds the interest rate, seeing it as profitable. When MEC equals the interest rate, investment reaches equilibrium. If the interest rate is higher than MEC, investment is discouraged. Thus, the interest rate acts as the cost of capital, which influences the level of investment. Investment is inversely related to the interest rate; lower rates encourage more investment, while higher rates reduce it. This theory emphasizes the role of interest rates in balancing savings and investment in the economy, leading to full employment equilibrium.