Some thoughts on the Civ 5 economy, after a couple days of playing a bunch of games on Immortal difficulty:
* Building costs are insanely high, production is lower than it was in Civ4 (worse specials, mine gives +1 not +2, etc). Also, production bonus %ages that you can get in Civ5 are lower than they were in Civ4.
There are two things that we should take from this.:
1) Your ability to build buildings is extremely limited, so only build the most critical ones. Don't build ones that give stupid bonuses and then cost you 2 gold in upkeep. Also, specialize cities. Build money bonuses is only one city that has trading posts. Build barracks and forge in only one city to make military, etc.
2) Mines are very helpful, as is working plains and hills tiles. Plains is better than grassland. Hills is better than plains. You should not ever farm a non-river tile. +1 food is much worse than the alternatives (except maybe right at game start). River tiles give +2 with civil service, so they are worth it. However, what we really want is not river grasslands, its river hills (2/2 with farm) and river plains (3/1 with farm). The presence of the hammer means it also gives another hammer in a golden age.
* A Maritime city state alliance can produce your food surplus FAR FAR more efficiently than farms, granaries, watermills, etc. Do a quest for a maritime city state and then gift them 250 or 500 gold. (Its worth selling resources to the AI to get gold to do this. The city state alliance will give you resources so you get them back). You get A bonus of food to every city that grows bigger with each age you enter, and its bigger in the capital as well.
The result of this is that you can focus a lot of your population on spaces that make good production and gold, not food surplus. The costs to grow city size start to get huge anyway after 6-8 or so. Run scientists, and utilize spaces with mines and trading posts, as well as farmed river plains and hills.
Maritime City states are they way to get your food. Do NOT build crappy granaries and watermills that cost 100 hammers and gold upkeep! Hammers are too scarce! Build science and happy buildings instead and get your food surplus from maritime city states!
* GOLDEN AGES (the way to actually be able to have decent production and gold income). Golden Ages are key to actually being able to build something in a reasonable time. You should aim to get a hammer and a coin from every space.
Non River grassland? Pile of crap that you shouldnt ever use.
Non River plains or hill? Trading post it. These are decent if you run out of good river spots and special tiles to work.
River grassland or floodplain? Ugh. I find myself trying to Academy some of these. Farm them and use them to grow to decent size, after which you stop using them and make specialists instead.
River plains or Hill. YAY! These are good tiles!! Farm it for good food with some production and gold.
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Civ V is like Civ III, not IV!! You mine land, you dont farm it! You want to get at least 1 hammer and 1 commerce from any space you will use, so that a golden age makes it good! You can get a bunch of food from a maritime city state. You dont need a ton of farms!
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Finally, in the Renaissance on you can get the Rationalism civic that makes trading posts give +2 science. If you arent going for a Piety based culture win, this is the way to go. +2 gold and +2 science is an amazing improvement for a tile! At the very least, make a gold and science city full of trading posts that has your science and gold bonus buildings!
If you go Piety tree instead (another strong tree), then you will instead focus on large excess happiness. This rolls into culture and triggers faster golden ages. At this point I would highly recommend investing heavily into either Piety or Rationalism, these definitely seem like the strongest pre-industrial trees to me.
* Building costs are insanely high, production is lower than it was in Civ4 (worse specials, mine gives +1 not +2, etc). Also, production bonus %ages that you can get in Civ5 are lower than they were in Civ4.
There are two things that we should take from this.:
1) Your ability to build buildings is extremely limited, so only build the most critical ones. Don't build ones that give stupid bonuses and then cost you 2 gold in upkeep. Also, specialize cities. Build money bonuses is only one city that has trading posts. Build barracks and forge in only one city to make military, etc.
2) Mines are very helpful, as is working plains and hills tiles. Plains is better than grassland. Hills is better than plains. You should not ever farm a non-river tile. +1 food is much worse than the alternatives (except maybe right at game start). River tiles give +2 with civil service, so they are worth it. However, what we really want is not river grasslands, its river hills (2/2 with farm) and river plains (3/1 with farm). The presence of the hammer means it also gives another hammer in a golden age.
* A Maritime city state alliance can produce your food surplus FAR FAR more efficiently than farms, granaries, watermills, etc. Do a quest for a maritime city state and then gift them 250 or 500 gold. (Its worth selling resources to the AI to get gold to do this. The city state alliance will give you resources so you get them back). You get A bonus of food to every city that grows bigger with each age you enter, and its bigger in the capital as well.
The result of this is that you can focus a lot of your population on spaces that make good production and gold, not food surplus. The costs to grow city size start to get huge anyway after 6-8 or so. Run scientists, and utilize spaces with mines and trading posts, as well as farmed river plains and hills.
Maritime City states are they way to get your food. Do NOT build crappy granaries and watermills that cost 100 hammers and gold upkeep! Hammers are too scarce! Build science and happy buildings instead and get your food surplus from maritime city states!
* GOLDEN AGES (the way to actually be able to have decent production and gold income). Golden Ages are key to actually being able to build something in a reasonable time. You should aim to get a hammer and a coin from every space.
Non River grassland? Pile of crap that you shouldnt ever use.
Non River plains or hill? Trading post it. These are decent if you run out of good river spots and special tiles to work.
River grassland or floodplain? Ugh. I find myself trying to Academy some of these. Farm them and use them to grow to decent size, after which you stop using them and make specialists instead.
River plains or Hill. YAY! These are good tiles!! Farm it for good food with some production and gold.
*********
Civ V is like Civ III, not IV!! You mine land, you dont farm it! You want to get at least 1 hammer and 1 commerce from any space you will use, so that a golden age makes it good! You can get a bunch of food from a maritime city state. You dont need a ton of farms!
**********
Finally, in the Renaissance on you can get the Rationalism civic that makes trading posts give +2 science. If you arent going for a Piety based culture win, this is the way to go. +2 gold and +2 science is an amazing improvement for a tile! At the very least, make a gold and science city full of trading posts that has your science and gold bonus buildings!
If you go Piety tree instead (another strong tree), then you will instead focus on large excess happiness. This rolls into culture and triggers faster golden ages. At this point I would highly recommend investing heavily into either Piety or Rationalism, these definitely seem like the strongest pre-industrial trees to me.