What caused the october 1929 stock market crash?

The correct answer is falling stocks purchased on credit.

During the 1920's, citizens were able to buy stocks on credit.This meant that they could pay a small percentage down (10%) and receive a loan for the other 90% from the bank. This worked well throughout the 1920's, as stocks continually climbed in price. However, when stock prices started to fall this helped lead to the collapse of the entire stock market. Citizens could not pay back their loans to banks and banks lost money the invested in the stock market as well.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."