What is the best definition of speculation, which was a cause of the Great Depression? the act of borrowing money for goods and not paying debts
the act of taking great risks in the hope of making large profits
the act of paying too much money for a good that has little value
the act of investing in farming equipment to increase production

the act of taking great risks in the hope of making large profits

Explanation:

Given that Speculation in business or investment relation is a term that describes a form of financial bargains that comes with a lot of high risks but at the same time with the probability of high returns in the end.

Hence, in this case, the best definition of speculation, which was a cause of the Great Depression is "the act of taking great risks in the hope of making large profits."