Beware one huge mistake investors often make when the economy is at a crossroads, says Charles Schwab’s investment chief

Charles Schwab chief investment strategist Liz Ann Sonders says we are moving into the third phase of the economy where growth decelerates but you still have accelerating inflation. Sonders says "when it comes to the relationship between economic fundamentals and the stock market, better or worse matters more than good or bad. So understanding that it's rate of change, it's the market's ability to sniff out an inflection point." She says historically economic data is almost always fantastic at the market top and always looks terrible at the bottom.