During the 1920s, buying stock on credit was called buying on speculation.
buying on a gamble.
buying on margin.
buying on margin call.

the answer is C. buying on margin

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can i know the options so i can answer the qu

question 10: the answer is c, to their constituents address a problem.

question 11: i think it would be domestic bills, which deal with american issues only and public bills, which affect the whole nation.