Help me with this question please, what caused the crisis of 1929?

Some people believed that abuses by utility holding companies contributed to the Wall Street Crash of 1929 and the Depression that followed. Many people blamed the crash on commercial banks that were too eager to put deposits at risk on the stock market.

Explanation:

less available tax revenue

this basically means that when they get money from taxes wirth having a lower gdp they get less then what others have with a higher gdp