Editing Time preference (section)

==Example==
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Calculating the discount rate: “Would you rather have $100 today or $110 in one month?” Your choice indicates your discount rate. If you choose $100 today, your discount rate is at least 10%. If you choose $110 in one month, your discount rate is less than 10%. Now how about “$100 today or $101 in one month?” Choosing the $100 today now indicates a discount rate of at least 1%, whereas choosing $101 in one month indicates that it is less than 1%. Asking a series of these questions, narrowing the interval, would show your discount rate. Typically, factors such as risk and interest rates heavily influence the choices.

A practical example: Jim and Bob go out for a drink but Jim has no money so Bob lends Jim $10. The next day Jim visits Bob and says, "Bob, you can have $10 now, or I will give you $15 when I get paid at the end of the month." Bob's time preference will change depending on his trust in Jim, whether he needs the money now, or if he thinks he can wait; or if he'd prefer to have $15 at the end of the month rather than $10 now. Present and expected needs, present and expected income affect one's time preference.