US shutdown: Why have markets been slow to react?
4 October 2013 Last updated at 10:13 BST
After largely shrugging off the first few days of a US government shutdown, US markets finally fell on Thursday due to worries over Washington gridlock.
The Dow Jones Industrial Average, S&P 500, and Nasdaq all closed down by close to 1%.
Wall Street trader Benedict Willis told BBC business reporter Mariko Oi, "the market is more concerned with the idea that the United States government may default".