If you say "I'm a businessman," doesn't that mean you are running your own business? Does that also refer to somebody working for a company? 用 英語 (美國) 要怎麼說？

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Someone who owns a business would be called an entrepreneur or a proprietor, a businessman/businesswoman would be someone who works in the business sector, usually at a high or executive level, such as an executive officer or director. So yes, it would be correct to say that a business person works for a company and does not own the company.