There were warning signs a big market sell-off was coming and investors believe there's more to go

Investors may have been surprised by the steepness of Wednesday's stock market sell off, but the market has been sending clues of a pending pull back. The sell-off could continue into the earnings season, which begins Friday, but some analysts expect a positive end to the year, as the market often gains after mid-term elections. The biggest worries for stocks are rising interest rates and the potential impact of trade wars and tariffs on corporate profits and the global economy.