Opportunity cost: what you're actually comparing against

A first-week economics concept that most people forget when actually deciding:

The real cost of any choice isn't the money or time you spend. It's the next-best thing you didn't do because of it.

Buying a $50,000 piece of equipment — the "cost" isn't $50,000. It's what that $50,000 could have done.
Working a weekend — the "cost" isn't fatigue. It's the family time, learning, or rest that weekend could have held.
Dinner with someone draining — the "cost" isn't two hours. It's the relationship those two hours could have built.

Why this view is hard to hold

Because "what you didn't do" never appears on a bill. It's invisible, abstract, requires active imagination. So people instinctively evaluate each decision in isolation: "Is this worth it?"

But "worth it" is never an isolated question. Its real form is: "Is this more worth it than what else I could do?"

A simple substitution

Next time you ask "is this worth it," replace it with:

"Is this more worth it than ___?"

Fill the blank with your next-best alternative. Could be another job, another investment, another use of money or time, rest, or doing nothing.

Examples:

• "Should I take this side project?" → "Compared to two more hours of sleep, exercise, family — is that $X more worth it?"
• "Should I buy this stock?" → "Compared to leaving it in the index fund, does this stock's expected return justify the added risk?"
• "Should I attend this gathering?" → "Compared to a quiet evening alone, what does this gathering give me that the alternative doesn't?"

When to use it

• Time, money, attention investment decisions
• "Too busy," "no time," "spread thin" moments — usually wrong priorities, not insufficient hours
• Any decision starting with "I should…"

When not to use it

Emergencies or no-choice scenarios don't need it — reality has narrowed the option set. Don't ruminate on already-committed investments — that becomes sunk-cost anxiety.

Full questioning lives on Hone's framework page.