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directed the flow of goods between England Colonies    The Navigation Acts required that all colonial trade be carried in vessels built and owned by English or colonial mâ¦erchants. The ships had to be manned by crews composed of British seamen.
One early attempt to quantify the economic effects of the Navigation Acts was by Thomas (1965). Building upon the previous work of Harper (1942), Thomas employed a counterfactual analysis to assess what would have happened to the American economy in the absence of the Navigation Acts.