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*All statistics except number of years were standardized by taking the ratio for each product of the average value of the relevant statistic (entry, exit and number of firms) per year in each stage to its average value per year across all stages experienced by the product.

Table 9 *All statistics except number of years were standardized by taking the ratio for each product of the average value of the relevant statistic (entry, exit and number of firms) per year in each stage to its average value per year across all stages experienced by the product.