06/14/2026
Sometimes the smartest career and personal financial moves is knowing when to leave a job, and there’s a great concept from behavioral ecology that explains it: Marginal Value Theorem.
In 1976, ecologist Eric Charnov developed the theory using the example of birds in a berry bush.
A bird lands on a berry bush (“a patch”).
At first, berries are easy to grab (high return).
As the bird keeps picking, the remaining berries take more time and energy to find (diminishing returns).
Eventually, even though there are still berries in the bush they are in, the bird reaches a point where the next berry isn’t worth the time, especially if another bush nearby offers a fresh start.
So the optimal strategy is to leave the current patch when the marginal gain drops below the average gain available elsewhere.
When the value you’re getting from your current “patch” keeps dropping, and there’s another patch out there offering at least what you started with, it’s rational to move on.
Translated to work life: If your growth, pay, or opportunities are steadily declining, that’s a signal. If other jobs still offer the same (or better) starting opportunity you once had, staying put isn’t loyalty... it’s stagnation. And relying on seniority as the reason to stay is a trap. Seniority only matters if the environment still rewards it. If not, it becomes an anchor.
You don’t have to wait until things get worse.
You don’t have to “tough it out.”
You don’t have to stay just because you’ve already invested years.
Sometimes the most rational, healthy move is simply recognizing: This patch is depleted. It’s time to move to a better one.
At Financial ACES, it's not just about helping with saving and investing. It's about having someone to talk through anything in your life that affects your money... including your job. If you ever want to talk through whether your current “patch” is still worth it, I’m always happy to chat.