Any advance in our knowledge about the growth and development of the American colonial economy must first start with a balance-of-payments study. The trade of the thirteen colonies with other areas— principally Great Britain, Ireland, southern Europe, the Wine Islands, the West Indies, and Africa—certainly must have formed, together with the coastal trade between the colonies, a large share of the total market activity. My conclusions from such a study are that the description given of commodity trade by colonial historians has been accurate but that once services as well as goods are considered the picture changes to one where there are only small positive or negative balances remaining on current account for the various regions. As a result, I would conclude that long-term capital flows from Great Britain to the colonies were either small or nil during this period.