NEW YORK — The Dow Jones industrial average stormed to its highest level in more than a year Monday as a falling dollar boosted prices for commodities including gold and oil. Stocks also jumped as investors grew more confident that governments around the world will keep interest rates low to help the global economy.

Energy and materials stocks led the market higher. Major indexes rose 2 percent, including the Dow, which jumped 200 points for the second time in three days, to its highest level in 13 months.

News that the Group of 20 countries will keep their economic stimulus measures in place signaled to investors that rates will remain low. With U.S. rates near zero, the G-20 news lessened demand for the dollar.

Investors see the dollar as weaker than other currencies, and so they're using it for what's known as "carry trade," to finance purchases of investments in other countries. That trend takes the dollar down further when those purchases are made.

But some analysts are questioning the markets' moves, and warn that stocks and other investments could suffer big losses if the dollar were to turn higher.

Still, many investors like a weaker dollar because it helps U.S. exporters by making their goods cheaper to overseas buyers and giving the companies a boost when they convert profits from abroad to dollars.

The ICE Futures U.S. dollar index, which measures the greenback against a basket of foreign currencies, fell to its lowest level in 15 months. The dollar rose last year and early this year but the index has been sliding for the past eight months since major stock indicators bounced off 12-year lows. Investors, although they've been basing most of their buy or sell decisions on the economy, have also been following a pattern of funneling money into stocks when the dollar weakens and pulling it out when the currency rises.

Commodities prices, meanwhile, tend to rise when the dollar is down, so gold topped $1,100 an ounce. Crude oil rose $2 to settle at $79.43 per barrel on the New York Mercantile Exchange, helped in part by Tropical Storm Ida, which threatened the Gulf of Mexico.

Energy and materials stocks rose along with commodities prices, and investors' enthusiasm for those stocks spilled over to other industries.

Brian Battle, vice president of trading at Performance Trust Capital Partners in Chicago, said the strength of the carry trade is giving an artificial lift to a range of assets, including stocks.

"There's cheap money that's going to be pumping its way into the system," he said. "That money is finding is home in the currency and commodity markets."

According to preliminary calculations, the Dow rose 203.52, or 2 percent, to 10,226.94, its highest finish since Oct. 3, 2008. The index rose as high as 10,228.23, topping its previous 12-month trading high of 10,119.46 set last month.

The broader Standard & Poor's 500 index rose 23.78, or 2.2 percent, to 1,093.08, its sixth straight advance. The Nasdaq composite index rose 41.62, or 2 percent, to 2,154.06.

Five stocks rose for every one that fell on the New York Stock Exchange, where volume came to 1.2 billion shares compared with 1.1 billion Friday.