Thomas Robert Malthus
The definition of free market has been disputed and made complex by collectivist political philosophers and socialist economic ideas. This contention arose from the divergence from classical economists such as Richard Cantillon, Adam Smith, David Ricardo and Thomas Robert Malthus and from the continental economics developed primarily by the Spanish scholastic and French classical economists, including Anne-Robert-Jacques Turgot, Baron de Laune, Jean-Baptiste Say and Frédéric Bastiat. During the marginal revolution, subjective value theory was rediscovered.