Compare Britain's colonies in their roles as producers of British imports to their roles as consumers of British exports. Why are the mainland colonies of North America a distant third as producers of imports, but ranked first as consumers of exports?

The question was based on the Revolution and Republican Culture it showed a table of imports and exports between Britain and its Colonies 5.1 p. 153 showing that Britain made greater exported products to the colonies and imported less. Colonized countries were required to have the export goods from Britain, they don't have control on trading because Britain decides the economic condition of the colonies.