At the start of the month, the Dow Jones industrial average and Standard & Poor’s 500 index hit all-time highs. Now the market is down 4 percent from its peak, and August is on track to be the Dow’s worst month since May 2012. On Tuesday, the Dow posted in its fifth straight day of losses, the first time that’s happened this year. While the S&P 500 and Nasdaq composite index did rise modestly, it was first time in four days those indices have seen green. The stock market slide in the last couple of weeks reflects a shift in investor strategy that began in the bond market and spilled into stocks.