Those who favor it argue that markets are inherently efficient, so there is no use in trying to beat them. Today's Stocks & Topics: DISCA - Discovery Inc. Series A, Expending Report, Savings Account, 30-Year Mortgage Rate, ETFs, DIS - Walt Disney Co., CELG - Celgene Corp., XLP - Consumer Staples Select Sector SPDR ETF, SPY - SPDR S&P 500 ETF Trust, Stop-Limit Order, Junior Mining Companies, LTUM - Lithium Corp., Penny Stocks, SCHN - Schnitzer Steel Industries Inc.