How did the Great Depression begin?

Responses

Investors began to worry the boom would end and began selling stocks.
Investors began to worry the boom would end and began selling stocks. - no response given

Investors paid back their loans too late to help the economy.
Investors paid back their loans too late to help the economy. - no response given

People were not willing to sell their stock.
People were not willing to sell their stock. - no response given

Farmers had to sell stock to pay for farm equipment.

Farmers had to sell stock to pay for farm equipment. - no response given