The S&P 500 is experiencing warns of medium-term selling pressure, signaled by bearish divergence on Twiggs Money Flow. The last correction was shallow, typical of stage III in a bull market, and this one is likely to be too. Respect of support at 2400 would signal another primary advance. A correction to test primary support at 2300 is unlikely, but would warn that investors are jumpy and taking profits. This would signal stage III is closer to a top.