"The landmark figure in general equilibrium theory was French economist Léon Walras (1834–1910), whose complex simultaneous equations essentially created this branch of economics in the nineteenth century. Back in the eighteenth century, however, another Frenchman, François Quesnay (1694–1774), was groping toward some notion of general equilibrium with a complex table intersected by lines connecting various economic activities with one another. Karl Marx, in the second volume of Capital, likewise set forth various equations showing how particular parts of a market economy affected numerous other parts of that economy. In other words, Walras had predecessors, as most great discoverers do, but he was still the landmark figure in this field."