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Two free stamps make you three days faster.

In 2006 Kivetz, Urminsky and Zheng handed loyalty cards to 108 café customers. One group needed 10 stamps, the other 12 – with two already given. Both had to buy 10 coffees. The head-start group finished in 12.7 days instead of 15.6.

Useful: Don't start projects at zero: list what's already done before you look at the list.

Source: doi.org

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This card belongs to the topic Mind & Everyday. Every card is short, cites a source and can be saved – due ones come back by themselves later.