the.com/popcorn stand

A machine that turns corn into margin so fat even movie theaters forgive bad films.

means A small kiosk or stall that sells popcorn and similar snacks, often at fairs, theaters, or street corners.

from Straightforward compound: 'pop' from the corn kernel's explosive burst when heated (the 'pop' of popcorn, a word recorded in American English by the mid-1800s), plus 'stand,' the common term for a small vendor's booth. The phrase 'popcorn stand' emerged as popcorn vending spread with street carts and steam-powered poppers in the later 1800s, then boomed alongside movie theaters in the 20th century — though 'stand' itself just means a place where a vendor stands and sells, no fancier than that.

origin
Depression-era vendors thrived while other businesses collapsed
theater economics
Cinemas profit more from popcorn than from films
markup
Popcorn can cost over a thousand percent above production
idiom use
Now means any wildly overpriced convenience operation
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