A child has just keeled over from exhaustion on my factory floor. I could have stopped it; when they get to that state you can give them a glass of water and they get straight back to the production line. But I've found it's cheaper to give them training instead of water. If a kid's looking peaky I can spend a little cash to have him trained up. He'll get over his exhaustion and he'll work faster. It's a win/win situation. If I let them work to the cusp of collapse before training them I maximise the amount of time they can work. I don't have to hire new workers and I don't need to waste money on a water fountain.