Eric Balchunas, Senior ETF analyst for Bloomberg Intelligence, and Dave Wilson, Bloomberg stocks editor, on market drivers and ETF flows amid the sell-off. Nick Colas, Co-Founder of DataTrek Research and Bloomberg Prophet, on markets, volatility, and where stocks could bottom. Lee Klaskow, Senior Transport, Logistics and Shipping Analyst for Bloomberg Intelligence,  Amazon planning a delivery service to vy with Fedex and UPS. Ward McCarthy, Chief Financial Economist at Jefferies & Co., on economic outlook, the deficit, and what to expect from the Fed.