Economics is more personal than most people realize. Every choice about how to allocate your resources is an economic decision, and time is your most basic resource as a writer. You expend time on your work in order to get income. Sometimes you know exactly what you’re going to do today and what you’ll get in return. A lot of the time you face choices. Which of your customers should get your attention first? Should you put them aside for a while and look for new income opportunities? Should you keep working on a time-consuming project or give it up as a lost cause?

Two economic concepts are useful in making these decisions: sunk cost and opportunity cost.
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