Oddly Wired
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decision making

You value an object more because you own it.

The endowment effect describes a persistent discrepancy between willingness-to-accept (WTA) and willingness-to-pay (WTP) valuations observed in experiments.

The 'emotional bond' explanation is an informal interpretation; the original study points to loss aversion, while critics argue it is an artifact of experimental design.

We struggle to see the true value of things we already possess.

Where this comes from

Study
Kahneman et al., 1990
What the check found
The study does show a ~2.5x gap, but the 'emotional bond' claim is speculation, and the robustness of the endowment effect is frequently challenged by procedural critics.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.