Sunk cost fallacy, a term derived from economics, is a powerful psychological mechanism that affects our decisions and productivity. This fallacy is the erroneous belief that past investments should influence the decision about where to devote current resources. This leads to poor decision-making and can significantly compromise your productivity.

Understanding The Sunk Cost Fallacy

The sunk cost fallacy comprises two critical ideas. Firstly, a ‘sunk cost’ refers to an investment that cannot be recovered once it’s made. It could be anything like time, energy, or capital. The ‘fallacy’ part is the incorrect reasoning that further investment is justified because the resources already invested would be lost otherwise.

When you let past losses dictate the future course of action instead of looking at what outcome would yield the most return (or the least loss), you’re caught in the sunk cost fallacy.

How The Sunk Cost Fallacy Impacts Your Productivity

The sunk cost fallacy can have a significant impact on individual and organizational productivity. It usurps valuable time and resources that could be better spent elsewhere, resulting in the ineffective allocation of those resources.

For example, you may persist with a project because of the time you’ve already devoted to it, despite clear signs that it will not meet objectives. Or, you might procrastinate on abandoning a long-term strategy that isn’t working because of the investment already made. And therein lies the paradox; you continue to invest in something unproductive to not “waste” the investments already made, while essentially wasting more resources.

An example of this might be investing a lot of time into college or university courses and then finding that you don’t like or aren’t suited to the career you are taking training for. But you don’t want to waste all that time, money, and energy you spent on university, so you decide to suck it up and continue.

Or you might have launched a business, sunk a lot of time and money into it, and then found it didn’t provide the income or satisfaction you were looking for, but you just don’t feel you can walk away because of all the time, energy and money you sunk into the business.

So you keep adding more time, energy, and money – throwing good money after bad (another fallacy) in the hopes that you can “fix” what is wrong and not lose your investment.

Breaking Free from the Sunk Cost Fallacy

So how do we know if we have fallen into the sunk fallacy? How do we break free of this fallacy?

“Don’t cling to a mistake just because you spent a lot of time making it”
– Aubrey De Graf

Be Aware

First, educate and train yourself (and your team if applicable) to understand the nature of sunk costs and how they can affect decisions. Awareness is the first step to creating a strategy for combating this kind of bias.

Separate Past and Future

Second, make an effort to disconnect the past from the future. Consider current conditions and future benefits when making decisions, regardless of past actions. This can help to create a mindset that values future outcomes over past investments.

Use Cost-Benefit Analysis

Finally, a practical way to combat the sunk cost fallacy is to use a cost-benefit analysis when faced with decision-making. This method forces you to weigh the potential future benefits against the costs.

By focusing your resources on shoring up past activities, you run the risk of missing opportunities in the present and future.


Don’t let the sunk cost fallacy rob you of your productivity. By focusing on future outcomes and understanding the pitfalls of this cognitive trap, you can improve your decision-making ability and enhance productivity. Remember, it’s not about what you’ve already spent, but what you can gain moving forward and investing your time, energy, and money wisely.

Need help deciding to let go of past endeavors and embracing your future? Check out my time management coaching program – I’d love to help you.