The basic idea is that consumption is worth more to you now than later. If given the choice between a great dinner this week or one a year from now, most of us would prefer the dinner sooner rather than later. Using the Samuelson formulation, we are said to “discount” future consumption at some rate. If a dinner a year from now is only considered to be 90% as good as one right now, we are said to be discounting the future dinner at an annual rate of about 10%.
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