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Seinfeld Economics: The Opposite
by Linda Ghent `

Sunk costs are costs that have already been incurred and which cannot be recovered. They should not be considered when making decisions.

From an economist's perspective, making choices involves thinking 'at the margin' - that is, making decisions based on small changes in resources. Doing so leads to the optimal 

This Commentary is related to the following Clips:
Seinfeld: The Opposite by Larry David & Jerry Seinfeld (1994) Elaine is to meet her boyfriend at the theater. She gets a message at the ticket booth that he's been in an accident. Before leaving to see him at the hospital, she stops for popcorn and Jujubes, reasoning that she can't change the past so she might as well maximize at the margin.