Neither the crash nor the depression were due to undistributed wealth.
The crash was caused (as far as I can tell) by buying on massively leveraged debt. The recession that followed was turned into the great Depression by the genius of government intervention. The Smoot-Hawley tariff - a protectionist scheme - prevented natural recovery after the crash.
Look at top marginal tax rates for the period....almost 100% for anything over 100,000.
Better to sit and do nothing rather than be an entrepeneur and try to make money for yourself , or to create jobs for other people.