Nor was it a satisfactory solution to keep the masses in poverty by restricting the output of goods. This happened to a great extent during the final phase of capitalism, roughly between 1920 and 1940. The economy of many countries was allowed to stagnate, land went out of cultivation, capital equipment was not added to, great blocks of the population were prevented from working and kept half alive by State charity. But this, too, entailed military weakness, and since the privations it inflicted were obviously unnecessary, it made opposition inevitable. The problem was how to keep the wheels of industry turning without increasing the real wealth of the world. Goods must be produced, but they must not be distributed. And in practice the only way of achieving this was by continuous warfare.