Jim Zarroli

The U.S. unemployment rate has been falling steadily over the years. Down from the recession peak of 10 percent in 2009, it reached 5.9 percent in September.

That's getting close to what economists call the natural unemployment rate — the normal level of joblessness you'd expect in a healthy economy.

But a lot of economists are asking whether the old rules about full employment still apply.

It was another stomach-churning day on Wall Street. At one point, the Dow industrials were down 460 points — a huge drop that followed four consecutive days of stock market losses.

The decline more than wiped out the year's gains. But then late in the trading day, tocks started to recover. And by the close, the Dow's loss was a little more than 1 percent.

Investors are worried about a global economic slowdown, the Federal Reserve's next move and even the Ebola virus.

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Burger King is buying Tim Hortons, the Canadian coffee-and-donut chain, in a deal valued at $11 billion. The new company will be headquartered in Ontario, Canada, allowing Burger King to take advantage of Canada's lower corporate tax rate. The relocation is bound to cause controversy in the U.S.

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The legal battle between Argentina and its creditors grinds on with no sign of a resolution anytime soon. The dispute pits the government against two New York hedge funds that specialize in buying distressed debt.

These hedge funds bought Argentina's bonds at fire-sale prices and now stand to make huge profits off the country's financial troubles. But they've encountered a lot of resistance from the government.

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