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Production Costs

Comments
A few costs have a fixed part that is not affected by happiness. For instance, corn costs at least 50 to plant, no matter how much happiness you have.
I try to stay in the -50% to -70% range. Below -50% a tiny change in happiness means a huge change in production costs, and over 70% it takes a big change in happiness to change production costs much.
Adding or upgrading houses increases the number of workers, but also increases unhappiness. Decorations increase happiness. Doing certain events gives a reward of a decoration that gives a lot of happiness for its size.
With that "deco pickup truck", I was able, after spending a few hundreds of millions in game money to have my 3 farms running at really low running cost while maintaining a very decent amount of production units.
My farms are -85%, -80%, -93%. Makes a BIG difference in running cost and money output by the farms.
Hope that helps.
IO