 The Ricardian model is a general equilibrium mathematical model of international trade.Although the idea of the Ricardian model was first presented in the "Essay on Profits" (a single-commodity version) and then in the "Principles" (a multi-commodity version) by David Ricardo, the first mathematical Ricardian model was published by William Whewell in 1833.The earliest test of the Ricardian model was performed by G.D.A MacDougall, which was published in "Economic Journal" of 1951 and 1952.