Central and southern wheat farms produce 1.6 carts/month.
All other farms, clay pits, timber yards, and iron mines produce 0.8 carts/month.
Marble quarries and workshops produce 0.4 carts/month.
Each person who does not live in a tent eats 0.005 carts of food per month.
Each house uses 0.02 carts of each required good per month, except that a palace uses 0.04 carts of wine per month.