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Many businesses are seasonal.
In the early days of the personal computer industry, Christmas consumer sales were an important part of annual results, ending the year on a strong note. The March quarter would fall back, then June would improve - PCs make good graduation presents, after all. Today, US retail volume accounts for only 16 percent of total PC sales. And with the major consumers in the corporate and Asian markets, the seasonal patterns are changing. But on a sequential basis its pattern shows flat March and June quarters, a small increase for September, and a big jump in December.