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As of last week, a significant price increase has hit three of the world's largest-produced metals: aluminum, copper and steel.
Aluminum costs $1.41 per pound, up 18 cents since 2007, according to the London Metal Exchange.
Copper costs $3.98 per pound, a 41-cent jump from 2007.
Steel, one of the most common materials in the world, is not measured by the pound in the United States, but by the short ton, said John Mothersole, senior economist for Global Insight, an international financial and economic forecaster. A benchmark product of the metal, a hot roll of carbon sheet, costs $1,052 a short ton.
Metal demand has caused the price spike in recent years, he said. And growth in India, Brazil, Russia and especially China, has put pressure on the global market, he said. "Since 2003, 75 percent of growth in primary metal consumption has been accounted for by China," he said. Here are comparisons between last year's prices and those from last Friday:
* Aluminum
2007: $1.23 per pound
Now: $1.41 per pound
* Copper
2007: $3.57 per pound
Now: $3.98 per pound
* Steel
2007: $532 a short ton
Now: $1,052 a short ton
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