Opportunity Cost — Economics
In Economics, opportunity cost is the the loss of potential gain from other alternatives when one alternative is chosen.
Every decision we make has an opportunity cost.
If I decide to spend $1000 to go on that cross crountry road trip I’ve always wanted to go on, that’s 1000$ that can potentially compound into $50,000 twenty years down the road [1].
Deciding to do a gap semester has an opportunity cost. Figuring out which essay topic to write about has an opportunity cost. Choosing which startup to invest in has an opportunity cost.
Note
[1] Will Robbins talks about this in his piece, The Paradox of Compound Interest—which he argues that experience compounds as well.