What is a Chamber? Or a Business Club?

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From Wikipedia:

A Chamber of Commerce (also referred to in some circles as a Board of Trade, though this phrase is not commonly used in the United States) is a form of business network. The primary goal of a chamber is to improve the business climate in a locality, typically through business networking, lobbying, and common projects and a selection of business services.

Q: What is a Business Club?

A: Pretty much whatever it wants to be, I guess!