According to keynes, which sector was most responsible for the instability that led to the great depression?

The  stock investment sector was to largely to blame for the stock market crash of 1929 that spiraled into the worst depression of the industrialized world.

the great depression hit the English world the hardest because of the stock investments, because as stocks prices plummeted, investors hurriedly sold their stocks. The problem is that much of the money used to buy these stocks had been obtained on credit from banks. Investors could simply not repay their loans.

Government taxes ? i guess