Question Description
 Locked before Monday, May 8, 2017 12:00 AM PDT.
Unfortunately, we all live in a world of constraints. There aren’t many people who can make an expensive purchase without foregoing something else, or take on a new project without taking time away from an existing one. Usually, these are fixed-sum constraints; we only have so much discretionary income per month, and so many hours in a day. Sometimes the options, or the things from which we’re choosing, are related. For example, you can’t get a new car with premium speakers unless you also order OR
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