A. Provinces with gold and purple dye boost public order at higher levels. Of course, they still cost food.
Since gold cities have the highest industrial income, it is good to increase the industrial base and bonuses with both industrial buildings, and the industry boosting temples that many civs get.
Since purple dye provinces offer a large base income from commerce, in those provs build ports, and commerce boosting buildings like the commerce boosting temple and amphorae factory)
B. Provinces with lead and "market" boost the wealth from all buildings within the province (just like the main city in the province).
This means that lead and "market" provinces are ideal locations to put high income buildings (trading ports, the income producing temples and high income city center buildings like wine trader, brickmaker and unique high income buildings like the Ptolemaic Great Library and the Roman Colosseum).
C. The glassware cities give big boosts to research rates at higher levels.
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