The benefit-cost approach to economic choices turns out to require only four basic rules, though they imply also a principle, namely that only the future really matters, not the past. The four rules are: (1) convert all values to the present times; (2) reduce all values for uncertainty; (3) all values must be aftertax; (4) non-money costs and benefits should be considered. These rules are explained and illustrated by working through the most difficult of economic choices: deciding how much to save. Key Words: benefit-cost, economic insights, rational choices, retirement planning

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