Field note 18 / 24·4 min
What does a saved hour make possible?
Time has an opportunity cost even when no money changes hands.
Name the next-best alternative
Opportunity cost is the value of the next-best option you give up. It is not the sum of every imaginable alternative. Choosing to spend an evening on a course might give up a shift, time with a friend, or rest; which one matters depends on what you would actually do instead.
Use money as one lens
To compare two travel routes, calculate the additional cost divided by the time saved. That tells you the price of buying back an hour in that situation. It does not tell you your human worth, or guarantee you can sell that saved hour at your salary rate.
Consider reliability, safety, energy, accessibility, and whether small fragments of time are useful. Twenty saved minutes may make a childcare pickup possible even if you never earn extra income. The most useful comparison makes both the tradeoff and the alternative explicit, rather than assuming the cheapest option always wins or that all unpaid time is worthless.
A faster route has an hourly price
A faster commute costs 4 extra and saves 20 minutes. Since 20 minutes is one third of an hour, the implied cost is 4 ÷ (1/3) = 12 per hour saved. Whether that is worthwhile depends on your budget and what those minutes make possible.
Illustrative numbers, in consistent units.One thing to try
Pick one recurring time tradeoff. Calculate its extra cost per hour saved and name your next-best use of that time.
You choose a course instead of your next-best option, an evening of rest. What is the opportunity cost?
Source notes
These references support the general principles. Product terms and legal protections vary by country.
- Opportunity costFederal Reserve Education, US · Checked 2026-11-03
For general education. Examples do not include every fee, tax, personal circumstance or local rule, and are not individual advice.