Milton Friedman argued that the Great Depression resulted from banks failing to support the economy, particularly criticizing the Federal Reserve for not providing liquidity to smaller banks. The discussion highlights the relationship between stock market practices and the money supply, suggesting that lax margin buying rules contributed to the financial crisis. Some participants propose that stock trading should be linked to job creation, advocating for regulations that would tie investor actions to company performance and workforce stability. Others counter that the relationship between money and jobs is not direct enough to support such theories, emphasizing that companies use stock offerings as an alternative to loans. Overall, the conversation explores the complexities of financial regulation and its potential impact on economic stability.