Which of the following most contributed to the stock market crash in 1929?
1. Excessive speculation and stock market manipulation
2. Overleveraging and excessive margin trading
3. Poor regulation and lack of oversight
4. Economic and agricultural distress
5. Bank failures and tightening credit conditions
All of these factors played a significant role in contributing to the stock market crash in 1929, but excessive speculation and stock market manipulation, overleveraging, and poor regulation are often cited as key factors leading to the crash.