How Does Opportunity Cost Apply to Investing?
Every dollar invested in one asset is a dollar not invested in another. Keeping cash in a low-yield savings account has an opportunity cost equal to what that money could have earned in the stock market. Choosing a bond over equities, or paying off a mortgage over investing in an index fund, all involve trading one potential return for another. Explicitly calculating this trade-off improves financial outcomes.
What Is the Opportunity Cost of Paying Off Debt Early?
Paying off a 4% mortgage early has an opportunity cost of whatever you could have earned by investing that money instead. If the stock market historically returns 7–10% annually, you may lose more in foregone investment gains than you save in mortgage interest. However, the psychological benefit of being debt-free and the guaranteed risk-free return of eliminating debt also have real value.
How Do Businesses Use Opportunity Cost?
Companies evaluate opportunity cost when allocating capital, hiring employees, or choosing between projects. A business that uses factory space to make one product forgoes revenue from whatever else it could have produced. Understanding opportunity cost prevents organizations and individuals from naively comparing a choice only to doing nothing — rather than to the best realistic alternative.
Frequently asked questions
Is opportunity cost the same as sunk cost?
No. Opportunity cost is forward-looking — it's what you give up by making a future choice. Sunk cost is backward-looking — it's money already spent that cannot be recovered. Good financial decisions ignore sunk costs and focus on opportunity costs of future options.
Does opportunity cost apply to everyday spending?
Absolutely. Spending $200 on dining out carries an opportunity cost of what that $200 could have grown to if invested for 20 years. That's not to say you should never spend money, but awareness of opportunity cost encourages more intentional tradeoffs between present consumption and future wealth.