Assume you have lent your brother 1000 laris, and because he is a close family member, you do not charge interest from him. One day you get a phone call from your brother, and he offers you to pay back the debt either today or in one year from now. What would you choose? If you act in line with standard economic theory, you would choose to get the money back today. You are driven by what economists call time preference, a kind of “psychological interest rate” with which you discount future payoffs.
There are a couple of reasons why it makes sense for hum...