Final answer:
The Securities and Exchange Commission (SEC) has had the biggest long-term impact on the American economy among the listed New Deal policies. The Tennessee Valley Authority (TVA) and the Civilian Conservation Corps (CCC) also played significant roles, but their long-term impact on the broader American economy has been relatively limited or indirect.
Step-by-step explanation:
The Securities and Exchange Commission (SEC), established in 1934, has had the biggest long-term impact on the American economy among the listed New Deal policies. The SEC was created to regulate the stock market and protect investors from fraudulent practices. It brought about increased transparency and stability in the financial markets, which has had enduring effects on the economy.
The Tennessee Valley Authority (TVA) was another significant New Deal policy. It aimed to provide electricity, improve navigation, and promote regional development in the Tennessee Valley. While it had a significant impact on the region's development, its long-term impact on the broader American economy has been relatively limited.
The Civilian Conservation Corps (CCC) and the Federal Emergency Relief Act (FERA) were important policies that provided employment and relief to Americans during the Great Depression. While they had immediate benefits in terms of employment and welfare, their long-term impact on the American economy has been more indirect.
Learn more about Long-term impact of New Deal policies on the American economy