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Seasonality is a big part of business. For some industries, seasonal patterns are a defining feature. Agriculture is one obvious example; tourism another. Western toymakers notch up a huge proportion of their annual sales in the run-up to Christmas. Construction is harder during cold weather, which is why that industry employs fewer people in the winter.
Firms that are less obviously tied to the seasons can still be deeply affected by them, as a recent review by Ian Hohm of the
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