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Domestic Logistical distribution

Add Economic Policy "Logistical Distribution":
I, II, and III tiers are unlocked by the "Imperial Dawn" (Ancient Era), "Medieval Markets" (Medieval Era), and "Urbanization" (Industrial Era) Civics respectively.

Domestic Trade Routes:
Each Farm, Pasture, and Fishing Boat in the destination city provides the starting city with +2X Food and -2X Gold;
Each Mine, Quarry, and Lumber Mill in the destination city provides the starting city with +2X Production and -2X Gold.

Where X is the policy tier level.