decision making

You value things more when you think they required effort.

A 2004 study showed that participants valued the same physical objects more when they were told the creator struggled to make them.

Kruger et al., 2004, Journal of Personality and Social Psychology

Your assessment of value is often a measure of presumed labor.

Where this comes from

Study: Kruger et al., 2004, Journal of Personality and Social Psychology
What the check found: The core psychological effect is correctly identified, but the claim misidentifies the year of the study as 2012 instead of 2004.
Confidence: Well replicated

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