What does the author of Chapter 9, Tony Weis, identify as one of the main reasons why industrial food has been so cheap? Question 39 options: 1) The industrial food system has externalized many of the inputs and wastes. 2) The industrial food system focuses on growing crops that are cheaper to produce. 3) The industrial food system has created significant efficiencies. 4) The industrial food system minimizes the use of physical labour, minimizing the cost of production