interest rate and risk are the only two factors involved in your question. if money is tight, then people are gonna charge you more to use it-hence increase in interest. also if the economy is red-hot the federal reserve steps in and says, "lets raise interest rates and everyone will stop doing so much business because interest is higher". if your business venture or loan is "risky" then a company is going to charge you a higer rate of return on their money- hence you pay more for the money.
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The marginal cost of capital (MCC) is the cost of the last dollar of capital raised, essentially the cost of another unit of capital raised. As more capital is raised, the marginal cost of capital rises.
increase output
If a firm's marginal revenue is greater than its marginal cost, it should increase production to maximize profits.
because of deprecation
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