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- Wharton economist Jeremy Siegel says he's shocked the Fed has overlooked the drop in bank lending.
- Banking chaos and tighter credit could spur a big fall in US economic activity, he told CNBC.
- He expects stocks to struggle in the next 6 months – and lifted odds of a recession this year.
Wharton professor Jeremy Siegel says he's amazed the Federal Reserve has overlooked tighter lending standards, while warning US stocks could struggle over the next six months.