The Sunk Cost Fallacy: Knowing When to Change Course

We saw this article in The Farmers Club newsletter and thought it might resonate with some, and aligns nicely with supporting decision making through the GRDC RiskWi$e project. Reproduced with permission from the author.

Australian farmers are no strangers to tough decisions. Seasonal conditions, commodity prices, labour shortages and input costs can all shift quickly, requiring constant adaptation. Yet one of the biggest challenges in farm business management is knowing when to persist and when to let go.

This is where the sunk cost fallacy can creep in.

A sunk cost is any money, time, or effort already invested that cannot be recovered. The fallacy occurs when those past investments influence current decisions, even when the evidence suggests a different course of action would be better for the future.

The thinking often sounds like this:

“We’ve already spent too much to stop now.”

“We’ve come this far, so we have to keep going.”

“If we change direction, everything we’ve invested will be wasted.”

While understandable, this mindset can lead farm businesses to commit more resources to strategies that no longer deliver the desired returns.

Effective decision-making requires a different perspective. Rather than asking, “How much have we already put into this?” ask, “Knowing what we know today, would we make the same decision again?”

If the answer is no, it may be time to reconsider.

To avoid the sunk cost trap:

• Focus on future returns, not past investments.
• Set clear review points for major projects and purchases.
• Use objective data, not emotion, to guide decisions.
• Seek advice from trusted advisors, accountants, or business mentors.
• Recognise that changing course can be a sign of good management, not failure.

Strong farm businesses are built on informed decisions, not just determination. Persistence matters, but so does adaptability. The goal is not to justify yesterday’s investment. The goal is to position the farm for a stronger future. Sometimes the smartest and most profitable decision is having the courage to change direction when the facts change.

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