Solid economic growth in the U.S. and abroad has helped push up prices for oil, lumber, cotton and many other commodities this year.
The trend is one reason why the price of U.S. crude oil has been moving higher since last summer, recently crossing the $70 a barrel threshold for the first time in more than three years, and why energy sector stocks are up 5.5 percent this year.
The United Nations recently issued a forecast calling for the global economy to expand by more than 3 percent this year and next year. Last month, the International Monetary Fund projected worldwide economic growth of 3....
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