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This might be hardwired into us by evolution.

Humans are one of the rare species that actually think into the future and are doing sacrifices in favor of it in the precent. Yes, squirrels might store nuts for the winter, but this behavior comes from the DNA level and is not a result of logical thinking. Humans do go for immediate satisfaction in many cases, usually when tomorrow is highly uncertain. But when there's a steady culture where work done in the precent can hold its worth - or even increase in value when invested - it encourages waiting for the second marshmallow.

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it encourages waiting for the second marshmallow.

:)

I know you love the marshmallow simile :)

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This might be hardwired into us by evolution.

I think it is, but we also have developed some level of self control. However, instant gratification beats delayed more often than not in most people.