"As already noted, major factors bringing on the Great Depression were the severe monetary contraction that the Federal Reserve presided over, unit banking laws that made it almost impossible for small-town banks to diversify their portfolios, high-wage policies that made it more expensive for employers to hire people, the 1930 Smoot-Hawley tariff that throttled trade, and the 1932 tax hikes that took money out of people’s pockets."
Great book on the subject: http://www.amazon.com/FDRs-Folly-Roosevelt-Depression-ebook/...
"As already noted, major factors bringing on the Great Depression were the severe monetary contraction that the Federal Reserve presided over, unit banking laws that made it almost impossible for small-town banks to diversify their portfolios, high-wage policies that made it more expensive for employers to hire people, the 1930 Smoot-Hawley tariff that throttled trade, and the 1932 tax hikes that took money out of people’s pockets."