Paper mill

Paper mills are used to create paper out of wood using energy.

Creation
Paper mills are unlocked after buying your first Oil-Burning engine. The first one costs 200 iron 200 money and 100 oil. The cost increase is 1.1 for all building materials. Also at certain higher levels of prestige you can begin to receive paper mills for free. This does not affect the base cost.

Production
The base paper mill uses -1 energy -3 wood/s and +1 paper/s.

With the thinner paper upgrade it uses -1 energy -3 wood/s and +2 paper/s

Base
-1.5(.5/wood)/s + 4(4/paper)/s = 2.5 prestige/s at a cost of 1 energy

Tinner paper
-1.5(.5/wood)/s + 8(4/paper)/s = 6.5 prestige/s at a cost of 1 energy