More loop-the-loops on the track ahead

US stocks finished a wild week slightly lower but strategists say there are more loop-the-loops on the track ahead.

Earnings reports this week from major retailers such as Target, TJX and Best Buy will have some sway and central-bank updates could cause moves. But markets will remain hypersensitive to statements from US, Chinese and Iranian leaders on trade and war.

"(Last) week has shown the power of the tweets and the reaction to them from algorithmic traders," said Quincy Krosby, the chief market strategist at brokerage Prudential Financial.

Last Monday, Beijing's decision to retaliate against US tariff threats caused the bigges…