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In general, the investment depends on the low efficiency of investment and interest rate. What causes the private investment? Obviously, the profit expectations seem great influence on the investment decisions of individuals, and these gains are in turn influenced by the current and the degree of economic activity, changes in technology and so on.

Suppose that a man takes the money to invest. It should interest on the loans. But it is expected to benefit from this investment. It should therefore pay the interest on winning goal, which he expected. Obviously, the return or profit must be at least the interest rates, otherwise no investment. As long as the share of profit on the interest rate, the investments remain facts.

The expected return of a new unit of capital is considered marginal efficiency of capital. This efficiency outskirts of the capital should never fall below the current rate if the investment is useful.

The interest rate is not too fast. Consequently, the incentive to invest in the whole depends on the efficiency on the outskirts of the capital. If expectations of the company are good, or if the effectiveness outskirts of the capital, the more investments are carried out despite high importance. On the contrary, a muddy depression or profits, investment holding, even if the interest rate level is low. For example, the volatility of investment is mainly due to fluctuations in the performance edge of the capital.
There are other factors that influence the investment. For example, if a company has a capacity and can be easily manipulated increase of future demand, it will not go to new investments to their capital hardware.