Amazon stock plunged 8% in premarket trades Friday. The e-commerce giant reported second-quarter results that topped Wall Street's expectations, but gave a mixed outlook. For the current quarter, Amazon predicted sales of $176.75 billion at the midpoint of its range, compared with analyst expectations for $173.27 billion.

Stocks slumped and Treasury yields fell sharply Friday (August 1) after a weak report on hiring and the latest gyrations in US trade policy shook Wall Street. The S&P 500 fell 1.8% and is on track for its biggest decline since late April.

The July jobs report showed nonfarm payrolls expanded by 73,000 last month, well beneath the consensus estimate from economists polled by Dow Jones that called for a 100,000 incre