The interest rate on these investments is so low, people will have to save an extraordinary amount to build up the retirement money they'll need.Today's Stocks & Topics: GPRO - GoPro Inc., Low Interest Rates, Retail Sales, the Wash Rule, P.E. Ratio, SKX - Skechers USA Inc. Cl A, NFLX - Netflix Inc., Diversification, Emergency Funds, DEO - Diageo PLC ADR, SWHC - Smith & Wesson Holding Corp.