Stocks sink again, continuing a dismal streak for markets; Dow drops 574 points

Stocks sank again Friday, continuing a dismal streak for markets; the Dow Jones Industrial Average has dropped more than 500 points in midday trading.
The sharp fall erased an early gain, as the market closed in on its third weekly decline in four weeks.
The latest wave of selling sent the Dow Jones Industrial Average down more than 500 points on top of hefty losses for the blue-chip average this week.
Losses in technology and health care stocks accounted for much of the market’s slide. Re