pop/food/gold rebalance..
eh.. there isn't much to it really.. basically.. city gets less pop, others (most of them) get more. towns and would be pretty much neutral or slight deficit regarding self sufficiency in food. in any case it's not something that you can plan for... if you don't produce food, you still have to buy them. if you produce tons.. you sell, just like before.
only big thing is that food is harvested every day.
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there's also new TO ... everyone does their bit actively