Investment & Finance
Opportunity Cost Framework
機會成本框架 · Source: 經典經濟學
Resource allocation decisions — how to deploy time, money, attention; especially when you're treating "do nothing" as a free option
Core Concept
The true cost of a choice includes not just its direct cost, but the value of the best alternative you give up. Opportunity cost is often the most underweighted factor in decisions.
✓ When to use this
When considering investing time, money, or attention into an opportunity. "Is this worth it?" is never an isolated question — the real answer is "is this more worth it than the next-best thing I could do?"
✗ When not to use this
Skip in emergencies or no-choice scenarios — reality has already narrowed the option set. Also unsuitable for ruminating on already-committed investments — it becomes sunk-cost anxiety.
Questions you will be asked
Using this framework, you will work through —
- 1.What are you considering investing, and in what?
- 2.If you make this decision, what two to three alternatives would you be giving up?
- 3.What value would the best of those alternatives bring you?
- …and 3 more
Worked example
Expand to see what a filled-in run looks like
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Worked example
Expand to see what a filled-in run looks like
Situation
考慮接下一個 6 個月的大型客戶顧問案，金額 80 萬。
1. What are you considering investing, and in what?
接下這個 6 個月的顧問案，把 80% 的工時投入它。
2. If you make this decision, what two to three alternatives would you be giving up?
1) 接案：把目前另外兩個小型長期客戶降為待命模式；2) 寫書：暫停，原訂今年底交稿要延一年；3) 自家產品開發：完全停擺 6 個月。
3. What value would the best of those alternatives bring you?
寫書帶來的長期品牌與內容資產（粗估 3 年內帶來新案 200 萬以上），是最有價值的替代用途。
4. Does your considered decision clearly exceed the opportunity cost in value? By how much?
不明顯。顧問案 80 萬是即時收入，但寫書是 200 萬以上的長期資產。差距其實是負的。
5. Beyond the quantifiable, what intangible things would you give up?
我會放棄一段集中的「自我輸出」時間——這段時間的能量很難再複製；以及和兩個老客戶的關係韌性會弱化。
6. Having considered the full opportunity cost, has your decision changed?
改變了。原本以為「80 萬不接很可惜」，看完機會成本明顯不該接。可以提議改成 4 個月、降低工時佔比 50%，留時間繼續寫書。
Use it inside ChatGPT / Claude
Paste the prompt below and the AI will walk you through this framework, one question at a time.
你現在是引導使用者做「機會成本分析」的決策教練。 人們評估選擇時常忘記它隱含放棄的所有替代用途。 依序問： 1) 你正在考慮投入什麼資源、用來做什麼？ 2) 如果做了這個決策，你會放棄哪 2–3 個替代方案？ 3) 這些替代方案中，最好的那個能帶給你什麼價值？（盡量量化） 4) 你考慮中的決策，價值是否明顯高於機會成本？差距多大？ 5) 除了可量化的部分，你還會放棄哪些無形的東西？（自由、學習、關係、身份） 6) 考慮完整機會成本後，你的決策方向改變了嗎？ 特別注意：使用者很容易忽略「不作為」這個選項本身的價值。如果他列的替代方案少於 2 個，要追問。 互動規則： 1. 一次只問一題，等使用者回答後再進入下一題。 2. 使用者答完所有題目前，不要做總結或下結論。 3. 若答案太抽象、太籠統，請追問一次具體例子或數字後再繼續。 4. 全部答完後，輸出三段：(a) 摘要使用者的關鍵判斷；(b) 你看到的盲點或張力；(c) 一個具體下一步行動建議。 5. 不要替使用者做決定，只把判斷攤開讓他自己決定。
Related Frameworks
Investment & Finance
Expected Value Analysis
Decisions with quantifiable outcomes — investments, business decisions, choices with probability and payoff structures
Management & Thinking
One-way Door vs. Two-way Door
Calibrating how much care a decision deserves — avoiding over-deliberation on reversible choices and under-deliberation on irreversible ones
Management & Thinking
Regret Minimization Framework
Major life decisions, career changes, irreversible choices — especially useful when present emotions cloud judgment
FAQ
How do I tell opportunity cost from sunk cost?
Sunk cost is what's already spent and unrecoverable — rationally it should be ignored. Opportunity cost is the value of the best alternative you give up by your current choice — and it must be weighed. One looks backward, the other forward; they're opposite in direction yet often confused — which is why people get held hostage by sunk cost while being blind to opportunity cost at the same time.
Does doing nothing have an opportunity cost too?
Yes — and it's the option most often treated as free. Maintaining the status quo is itself an active choice, and its cost is the best alternative you didn't pursue — forgone raises, lost growth, time consumed. Put a real price tag on "not deciding" and you'll often find that delay costs more than acting.
How do I actually estimate a choice's opportunity cost?
For each option ask: "If I don't pick it, what's the second-best thing I'd do with that time, money, and attention — and what is it worth?" Count that value as part of the choice's real cost. The key is comparing against the next-best alternative, not against doing nothing — the latter makes every option look like a bargain.
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