And what later happened in the 1800s, and this was no longer the Agricultural Revolution but the Industrial Revolution, is that the classical economists, and these were Adam Smith, David Ricardo, Karl Marx, the revolutionary, also asked the question "What is value?"
E poi, nell'Ottocento, dove non c'era più la rivoluzione agricola ma la rivoluzione industriale, anche gli economisti classici, ovvero Adam Smith, David Ricardo, il rivoluzionario Karl Marx, cominciarono a chiedersi: "Cos'è il valore?"