Video: These 3 Forces Could Spark a Stock Market Selloff

There are some worrisome forces lurking in the market.

Here they are:

• a July 6 tariff deadline
• light trading volume ahead of the July 4 holiday
• a lack of corporate earnings for investors to digest

Kenny Polcari, a managing director with O'Neil Securities, expects the S&P 500 to retest its 200-day moving average of 2,655.

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