Industry sim.

You have a small house, we can call it a factory. You need to eat. Somewhere to sleep.

Clothes.

You find an order of 1000 nailes. You have taken a loan of $500 from the bank with 8%

interest. You need to buy: Material (Iron), Tools (Hammer, Anvil, Tongs), Fireplace &

Energy (coal). You hire a worker (An old chap). Tell the worker to make nailes. It goes

slow, but steady forward.

I can simplify it a bit: You need, energy, material & labour.