The Rule of Three is often referred to as the Merchant’s Key or the Merchant’s Rule. Evidence of the Rule of Three can be found in literature produced as early as A.D. 250. Graunt used the Rule of Three to create a ratio for gender comparisons and to assert “that the value of the ratio served as proof that legislation against polygamy was consistent with the “Law of Nature”’(Klein, p.26). Graunt also used the rule to convince royal dignitaries that it was a useful and effective tool “in simplifying comparisons of awkward quantities”(Klein, p.27) noted
The Rule of Three is often referred to as the Merchant’s Key or the Merchant’s Rule. Evidence of the Rule of Three can be found in literature produced as early as A.D. 250. Graunt used the Rule of Three to create a ratio for gender comparisons and to assert “that the value of the ratio served as proof that legislation against polygamy was consistent with the “Law of Nature”’(Klein, p.26). Graunt also used the rule to convince royal dignitaries that it was a useful and effective tool “in simplifying comparisons of awkward quantities”(Klein, p.27) noted