le-entry bookkeeping method used by the Florentine merchants of the 13th century and described by Luca Pacioli, the "father of accounting" in book Summa de Arithmetica, Geometric, Proportioni et Proportionality published 1494. When you take, for instance, a contract that pays out $1 million if it rains tomorrow, a

le-entry bookkeeping method used by the Florentine merchants of the 13th century and described by Luca Pacioli, the "father of accounting" in book Summa de Arithmetica, Geometria, Proportioni et Proportionalith published 1494. When you take, for instance, a contract that pays out $1 million if it rains tomorrow, a

le-entry bookkeeping method used by the Florentine merchants of the 13th century and described by Luca Pacioli, the "father of accounting" in book Summa de Arithmetica, Geometria, Proportioni et Proportionalitd published 1494- When you take, for instance, a contract that pays out $1 million if it rains tomorrow, an

le-entry bookkeeping_ method used by the Florentine merchants of the 13th century and described by Luca Pacioli, the "father of accounting" in book Summa de Arithmetica, Geometria, Proportioni et Proportionalitei published 1494. When you take, for instance, a contract that pays out $1 million if it rains tomorrow,