Alcoa ( AA ) closed unchanged on the day. Continue reading for more on today's market, including : Schaeffer's Senior Trading Analyst Bryan Sapp points out where to "buy on weakness" in the short term. 3 Things to Know About Today's Market : The Consumer Price Index (CPI) posted its biggest drop since December 2008, declining 0.4% in April to fall short of economists' estimates for a 0.2% pullback.