As economies grow and the share of trade increases, the products imported and exported tend to change as well. On the import side, as incomes grow, countries typically import more sophisticated consumer goods and intermediate products as inputs to manufacturing. On the export side, as workers gain new skills and increase productivity, the composition of exports shifts away from primary products to manufactured products and even to some services, includind call centers, data processing, and other examples of what is commonly referred to as outsourcing.