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Given that the discount rate is always a key driver in cost-benefit analyses, figuring out a reasonable range for the discount rate is paramount. To do so, consider again the factors that underlie the discount rate: inflation (that the purchasing power of money can change over time), uncertainty (that benefits may or may not actually occur), and opportunity cost of capital (that you could do other things with your money). Since these factors are situationally dependent, there is unfortunately no standard answer for what discount rate to use for any given situation.