Typically, most of the capital to expand a business is borrowed. MacDowell’s has to borrow the cash to build out its new store. If the cost of capital is greater than the return on capital, then it makes no sense to expand. Let that sink in, because it is vitally important. You cannot borrow at 10% to earn 8%.
Of course not all of the capital is borrowed. MacDowell’s also puts up some of its own funds (or at least it would in a normal world without a central bank drowning the markets with liquidity). The company has to consider what else it could do with that cash. If it could earn more on a bond portfolio, why should it take business risk? Let this sink in also. You should not invest in business equity to earn less than the yield on bonds.
We have just looked at two connections between interest and profit margins. It is both impossible and undesirable, to expand a business which earns less than the interest rate. Now let’s look at the connection in the other direction. MacDowell’s profit-seeking behavior actually affects interest.
What happens to the interest rate if MacDowell’s borrows at two percent to build a hamburger stand that makes ten percent? The very act of borrowing pushes up the interest rate slightly (in a normal world). The very act of opening another hamburger store pushes down the rate of profits on hamburger stores.
…click on the above link to read the rest of the article…
