In this early version of his arithmetic applied to people, that meant proposing a change to who lived in Ireland as a way to make the territory more productive and its people less restive. He wrote, “If an exchange was made of but about 200,000 Irish and the like number of English brought over in their rooms, then the natural strength of the British would be equal to that of the Irish,” which would mean, Petty added, that “the Irish would never stir upon a National or Religious Account,” while the like number of Irish who were shifted across the Irish Sea would be far outnumbered by the
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