See, the way counting works, is that you count to 1 first, and then go on to count to 10.

But in a slightly less dickish answer, Europe is fundamentally at peace. We’re doing peacetime production, meaning that companies will only produce what they can sell at a profit until they at the very least recoup the investment. If the EU starts making 1.5m shells per month, nobody will buy them. Companies being companies, they will maximize profit, meaning they only really want to build efficiently.

Russia is fundamentally at war. They will buy every single shell anyone can produce. Screw profit, screw efficiency. If you’re hand-lathing 7 casings per year in your garden shed, they’ll take em. Volume is more important than cost or efficiency. Retooling existing factories, putting up old, inefficiënt and unprofitable factories is a great idea if all you want is more at whatever cost.

But if/when Europe goes to war, the same will happen. BMW will start making military trucks, Corus will be making shells and armor, Lego starts making claymores etc etc. But we’re not doing that right now, because economics doesn’t work like that.