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Which of the following is an example of an informal economic institution?

A. tipping

B. a credit union

C. a real estate office

D. a savings and loan institution

I would say that a. tipping is the correct answer

on the one hand, all the other options are formal and require a formally written agreement between all sides, and on the other hand tipping also proceeds very informally, for example by just leaving money in a jar or on the table.