Wow. That was ugly.
For investors, a brutal week ended Friday with prices plunging for stocks and commodities. The Dow Jones industrial average fell 531 to 16,460, a 3.12 percent drop.
Oil's tumble was especially notable. For a while, West Texas crude was trading below $40 a barrel — the first time that happened since March 2009. It finished at $40.45, marking an eight-week stretch of price declines — the longest losing streak since 1986.