Question 1

What exactly is opportunity cost?

Accepted Answer

Opportunity cost is the potential benefit you miss out on when choosing one option over another. In finance, it is usually measured as the difference in returns between the option you chose and the best alternative. For example, if you park $50,000 in a savings account earning 4% instead of investing it at 10%, your annual opportunity cost is $3,000 (the extra 6% you could have earned).

Question 2

Can opportunity cost be zero or negative?

Accepted Answer

Opportunity cost is zero when both options produce the same return. It becomes negative (meaning you made the better choice) when your chosen option outperforms the alternative. This calculator shows zero when the chosen option wins. In practice, opportunity cost is only relevant when the alternative would have been better.

Question 3

How does time horizon affect opportunity cost?

Accepted Answer

Time dramatically amplifies opportunity cost because of compounding. A small difference in annual returns (say 2% vs. 8%) barely matters over 1 year, but over 20 years it is massive. $10,000 at 2% for 20 years grows to $14,859, while at 8% it grows to $46,610. The opportunity cost of the lower-return choice is $31,751, more than three times your original amount.

Question 4

Should I always pick the highest-return option?

Accepted Answer

Not necessarily. Higher returns usually come with higher risk. A guaranteed 4% savings account has a real opportunity cost compared to stocks averaging 10%, but stocks can lose 30% in a bad year. Opportunity cost is one input in your decision, not the only one. Consider your risk tolerance, time horizon, liquidity needs, and personal goals before choosing.

Opportunity Cost Calculator

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