How did big brother solve the dilemma of "keeping the wheels of industry turning without increasing the real worth of the world"?

The State's solution was to keep, or make the masses believe, that their country is in a perpetual state of war,

"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. The essential act of war is destruction, not necessarily of human lives, but of the products of human labour. War is a way of shattering to pieces, or pouring into the stratosphere, or sinking in the depths of the sea, materials which might otherwise be used to make the masses too comfortable..."