When mulling over multiple choices, the quality of any option cannot be assessed in isolation from its alternatives. The price you pay (or the sacrifice you make, or the benefits you give up) for doing what you’ve chosen to do instead of doing something else is the opportunity cost.

In sum, an opportunity cost is the cost of passing up the opportunities that a different option would have afforded.

Many costs are calculated in terms of money. However, just because you don’t have to spend money to do something does not imply that the options you face are without their costs.

There’s an opportunity cost to even reading this, at this moment. You could have been watching TV, taking a nap, calling up a friend, or moving on to another article in the time you’re devoting to reading this article.

In a nutshell, even decisions that appear to be no-brainers carry the hidden costs of the options you will decline.

• Life is all about values and priorities. You face trade-offs. Life requires that you make choices among mutually exclusive alternatives. Every time you select something, you forfeit other alternatives and the concomitant benefits. The cost of something is what you will give up to get...