cathedral gives 10 times the gold you get from a mine, but it takes ~10min so is ca 150 times slower. so 2 cathedrals are a bit better then 1 farm
no guarantee on the values though
the speed of the bars approx halfes each step from farm to market to mine and you get 6 times the profit. so without upgrades and archivements:
1 Mine = 3 Markets = 9 Farms
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