Fiology: The Study of Financial Independence (FI)

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Fiology Lesson 42: Opportunity Costs


Fiology thanks Brad Barrett of Travel Miles 101 and  ChooseFI for shaping this lesson.

Opportunity cost is defined as the loss of potential gain from other alternatives when one alternative is chosen. In its essence it means that if you spend your time and/or resources on one event, you can no longer spend it on another. Today, after the longest stock market bull run in history, an investor may decide to shift her investments out of stocks to cash in order to reduce risk. In this example, the opportunity cost is potential investment returns of staying invested in the stock market.

Nearly every decision we make include trade-offs. You have heard that the cost of something is what we are willing to pay, or give up, to get it. And while money is a focus on our FI journey, it isn’t the only thing we should consider when faced with a decision. Fiology Lesson 11 encouraged us to Let Our Values Guide Our Decisions. The same thing applies here. Being aware of the concept of  opportunity costs, we are able to analyze and understand the impact our choices have on our bottom line and our quality of life, which should be guided by our values system.

The purpose of this lesson is to introduce and discuss the concept of opportunity costs so that our understanding of our decisions can be more complete, leading to more intentional future decisions.

Read:  Everything in Life Has an Opportunity Cost  by Nagesh Balludi of

Watch:  Opportunity Cost | The Road Not Taken  by EconClips of on YouTube

Read:  The Formula of Opportunity Cost & How to Calculate It  by Stash Team of

Read:  Early Retirement and Opportunity Cost  by Harry Sit of

Listen:  Opportunity Cost – The Economic Lowdown Podcast Series, Episode 1  by Federal Reserve Bank of St. Louis of

Take Action: Think about the last purchase you made above $1,000. List some of the opportunity costs of that purchase. Were those in line with your values and goals? Did it contribute to your happiness?

Additional Resources:

Read:  Opportunity Cost and The Concept of Enough  by Harry Sit of

Read:  The Opportunity Cost Fallacy  by Doc G of

Quote:  “Intelligent people make decisions based on opportunity costs.” – Charlie Munger is an educational resource designed to teach Financial Independence (FI). We scoured the internet to find content from the best and brightest of the FI community and created lessons covering the critical concepts.

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3 thoughts on “LESSON 42 : OPPORTUNITY COSTS”

    • SAHD FIRE,

      Thanks, I thought so too and that is why it exists. I couldn’t find anything like it so it was created to help give a framework to think about and efficiently navigate the concepts. Thanks for your comment!


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