The S&P 500 declined 1% in midday trading to 2,450.24.
The Dow Jones Industrial Average fell 1.2% to 21,722.23.
The NASDAQ dropped 1.5% to 6,340.43.
The yield on a 10-year Treasury bond was down 4.2% to 2.07%.
The price of gold was up 1.1% to $1,345.
Boot Barn Holdings Inc. (NYSE: BOOT) in Irvine declined 7.1% to $8.07 and a $214 million market cap. The western retailer’s shares had climbed 7.2% on Sept. 1 on a jobs report that was positively received.
San Clemente-based Glaukos Corp. (NYSE: GKOS) climbed 6.1% to $40.12 and a $1.4 billion market cap. Volume was twice its daily average of the past three months. Glaukos is a maker of products to treat glaucoma.