Many people who are in the general public don’t like “bankers” but without them, it is very difficult to build wealth and for a modern economy to function. Money is the means with which we engage in trade- it enables two people to trade goods and services.
Money permits the farmer to barter for medical services without having to travel to the doctor’s office with a lamb in tow to use for barter. It permits the doctor to barter with others for things that can’t readily be traded for- the doctor can’t mail a leg of lamb to the electric company, and it’s difficult for the electric company to barter with a bushel of electricity.
Once we admit that money is a necessary commodity that permits modern trade, we also realize that we sometimes don’t have enough liquidity to make large purchases. In these cases, we find someone willing to loan us the money. Seldom do we have friends and family that have enough in liquid assets to loan us money for a house or a car, so we enlist strangers and acquaintances to loan us money.
Those people aren’t going to loan us money without knowing the risks of not being repaid. They evaluate that risk, and looking at people with similar financial profiles, determine how risky it is to loan you money. That is, how likely is it that you will default on the debt and walk away with their cash? So let’s say that the lender determines that people whose financial situations are similar to yours default on loans 1% of the time.
The lender needs to be compensated for his administrative overhead, the risk he is undertaking, and still have enough for a profit. If he were to invest that same cash into a mutual fund, he would have significantly less risk and expense, so he needs to make more than he would make investing in that mutual fund.
In this case, the mutual fund would pay 2.5%. The lender’s overhead is another 1%. If the lender doesn’t get to charge at least 3.5% interest on this loan, he is only breaking even with that mutual fund, and that doesn’t even account for risk.
In order to measure risk, the lending industry has developed credit scoring, with Fair, Isaac, and Company (FICO) being the company with the most widely used scoring model. Let’s look at default rates for different FICO scores:
| Credit Score | % of the population | probability of default |
| 800 or more | 13% | 1% |
| 750-799 | 27% | 1% |
| 700-749 | 18% | 4.4% |
| 650-699 | 15% | 8.9% |
| 600-649 | 12% | 15.8% |
| 550-599 | 8% | 22.5% |
| 500-549 | 5% | 28.4% |
| less than 500 | 2% | 41% |
You can see that loaning money to people with a FICO score of 700 or higher means that you have a 6.4% chance of losing your investment. Using the numbers from our example above, if we were the lender, we would have to charge 9.9% interest to get the same 2.5% we would get from that mutual fund. In this case, we have one of two choices: we can lend to people with a 700 credit score or more, but at 10.9% interest, or we can loan to people with a 750 FICO or higher, and because the risk is lower, we could offer loans at 6.5%.
The issue here is that only 40% of the public has a score of 750 or higher, and everyone wants to lend to them because the risk is so low. For those reasons, competition is fierce for their business, and we will likely only be able to charge 5.9% for loans without collateral, and 5.7% for loans with collateral, because collateral reduces our risk.
This is of course a simplified example, but it does show that this is a simple math problem that balances risk with reward. This doesn’t mean that bankers are evil.
Let’s suppose that you had a chance to choose between two employers. One offered to pay you $20 an hour, and there was a 99% chance that your paycheck would cash without a problem. The second employer offers you $100 an hour, but there is a 35% chance that your paycheck will bounce. It’s a choice that you want to be careful with.
Banks do the same thing. Why would someone loan you money unless there was a reward for them doing so? Anyone who has loaned a friend or family member knows that there is a chance they will never see that money again, and that is for people you know. Absolute strangers are even more likely to walk.
I discovered that myself when I invested money in some peer to peer lending on Prosper.com. I put $500 into that website, loaning that money by partially funding several different loans. The terms there are simple- people see the credit scores of lenders, and bid on funding those loans at whatever interest rate they are comfortable.
So let’s say that you want to borrow $1,000 and your credit score is a 740. There is a 6.4% chance of a default, so the bidding begins. Your loan is funded by 30 people who offer to lend you the money at 8.9% interest. You have to repay that loan in 36 months, with a monthly payment of $31.75. At the end of the three years, the people who funded your loan would have received $1.10 in return for every dollar that they loaned you- a profit of 10% over three years. (some of the interest charged is given to Prosper to cover their expenses)
If you only make a year’s payments before defaulting, each dollar invested would only return 69 cents, meaning that the investors lost 31% of their investment.
That’s why interest gets charged, and a basic idea of how it’s calculated. If interest wasn’t charged, then there would be no money to lend to anyone.
