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After a drop last autumn, the U.S. dollar has climbed 5 percent against other currencies over the past two months, reaching the highest level since August.
The main reason is the U.S. economy. Although growth is still weak, the outlook for the U.S. is better than elsewhere in the developed world. Europe is stuck in a recession and struggling to control its debt. Japan is trying to push down the value of the yen to boost exports and end deflation.
A strong dollar helps Americans by making imports cheaper and keeping inflation low, but it can hurt U.S. companies two ways. Their goods become more expensive for overseas customers, and the profits on sales abroad are worth less when converted from a foreign currency to dollars.
The impact of the dollar's appreciation is starting to show up in earnings reports. The insurer Aflac, which does much of its business in Japan, says its earnings were hurt as the yen fell against the U.S. currency. Procter & Gamble, which makes Gillette razors and Crest toothpaste, said the stronger dollar was holding back its sales growth overseas.
Many analysts predict that the dollar will continue to rise. Here's a look at what a stronger dollar means for investors.
TOUGH FOR TECHNOLOGY COMPANIES AND MATERIALS MAKERS
A rising dollar could spell trouble for U.S. companies that make software and consumer products, as well as companies that make basic materials like aluminum.
The tech industry relies heavily on foreign sales for growth. About 56 percent of its revenue comes from outside the U.S., according to research by RBC Capital Markets. As the dollar strengthens, U.S. goods become more expensive overseas, discouraging buyers.
Investors worry that could slow business â¿¿ and profits. As a result, technology companies are tied with materials makers as the worst industry in the S&P 500 this year, rising just 4.2 percent, compared with 10 percent for the overall market. Business software giant Oracle said in its most recent earnings report, on March 20, that the rising dollar lowered its earnings by about two percent.