Oddly Wired
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motivation

You work harder as you approach a goal.

A 2006 study by Kivetz, Urminsky, and Zheng empirically resurrected the 1932 'goal-gradient hypothesis' by showing that consumers increase their purchase frequency as they approach a reward.

The claim is that the study discovered the effect, whereas it actually applied and verified an existing psychological principle in a new setting.

Your persistence is often just a product of proximity.

Where this comes from

Study
Kivetz, Urminsky, and Zheng, 2006, Journal of Marketing Research
What the check found
The study successfully demonstrated the effect in a modern marketing context, but it is not the origin of the psychological theory. It was a replication/resurrection of the 1932 goal-gradient hypothesis.
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.