A significant cause of the Great Depression of the 1930's was that 1.some banking policies were unsound and had led to the overexpansion of credit 2.a decrease in protective tariffs had opened American business to competition from abroad 3.a wave of violent strikes had paralyzed the major industries 4.consumer goods were relatively inexpensiveExplanation: During the "roaring twenties" many people bought new consumer good such as cars and washing machines on credit. Many also invested in the growing US stock market with borrowed money (stocks bough "on margin"). This increased debt, combined with a lack of oversight by any government agencies, was a contributing factor to the great depression.

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