Oddly Wired
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moral licensing

Doing a good deed makes us more likely to cheat later.

A 2010 study found that participants who bought green products were more likely to lie and steal in a subsequent task.

Researchers compared participants who shopped in an eco-friendly store with those who shopped in a conventional store. In a later, unrelated computer task, the eco-friendly shoppers were significantly more likely to cheat to earn extra money.

Your brain uses recent good behavior as a permission slip to slack off.

Where this comes from

Study
Mazar & Zhong, 2010, Psychological Science
What the check found
The 2010 study by Mazar and Zhong in Psychological Science indeed found that participants who bought green products in a lab store subsequently cheated and stole more in an unrelated task (the moral licensing effect).
Confidence
Well replicated

Related

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