A person who promotes or rides the wave of a boom, especially in business or development; someone who benefits from rapid economic growth.
From 'boom' (rapid growth) plus the agent suffix '-ster' (one who does), creating a word for someone actively involved in booms. Likely American English from the late 19th century.
Boomsters were the optimistic entrepreneurs who rushed to newly discovered oil fields and gold rushes, often making fortunes but sometimes losing everything when the boom ended. They embody the risk-taking spirit of frontier capitalism.
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