Sam Zell: It's difficult to have a recession when interest rates are zero

Global market uncertainty pushed markets lower to kick off September trading. Sam Zell, chairman of Equity Group Investments, Mandy Xu, chief equity derivatives strategist at Credit Suisse, and CNBC's Mike Santoli join "Squawk Box" to discuss.

Squawk Box U.S.,CNBC,business news,finance stock,stock market,news channel,news station,breaking news,us news,world news,cable,cable news,finance news,money,money tips,financial news,stock market news,stocks,