Equity markets were initially retreated after the speech of the President of the Federal Reserve.
But investors finally judging that the U.S. central bank left the door open for further support measures, the values are rising again.
“He did not offer the market a signal from a ‘EQ3′, but has not ruled out either,” said Kevin Caron, Stifel Nicolaus analyst in New Jersey, about a possible new round of quantitative easing.
The Dow Jones finished with a gain of 1.21% or 134.72 points to 11,284.54 while the S & P 500 closed up 1.51% or 17.53 points, to 1176, 80.
The Nasdaq was awarded for its 2.49% (60.22 points) to 2479.85.
For the week, the three indices are gaining 4.3%, 4.7% and 5.9%.
The CBOE volatility index, known as “fear gauge”, fell 10.2% after several days of uncertainty about the contents of the intervention of Ben Bernanke.
Technology stocks have had a particularly strong session. Cisco Systems gained 1.59% to 15.32 dollars, Microsoft has made 2.77% to 25.25 dollars, and Intel has awarded 1.8% to 19.77 dollars.
The sector index of information technology has gained 2.3%.
“The market is a broad rally, and as the technology has particularly suffered in the last sales phase, we see them now at the top of the rise,” said Gary Wedbush, head of trading in the regional investment bank Wedbush Morgan in Los Angeles.
The jeweler Tiffany jumped 9.35% to 69.01 dollars after raising its full-year and good second quarter results.
Next week trading activity could be affected by Hurricane Irene along the East Coast of the United States.
The exchange operator NYSE Euronext said that the New York Stock Exchange plans to open normally next week, but a final decision would be taken until Saturday or Sunday, because of the risk of flooding during Hurricane.