10 famrs/ Is this correct? You must be mad! You should only add as many farms as it will take for your people not to go ape crazy. I think even on a nice planet liek this 3 farms shoudl be absolute tops (Even thou you would be a brave man to put that many with 49% tax). I just think you are trying to make it too much about money. A nice planet that size should have 4 factories and a starport for sure, it will be a really good ship builder on top of everything else.

Besides in most games I end up with 4 or 5 economic capitals.

-80 morale is the max from population. You hit that at around 25 billion. While higher population gives more tax money, the amount of taxes you get per population reduces as population increases. It's better to have lots of markets than lots of farms.

I usually only put a max of 2 farms per planet, even really big ones. The reason? Morale. Even as a Neutral race with all the morale bonuses (trade goods, wonders, populists), your planets with large populations will be around 49 morale. I do set the taxes at a whopping 69% later in the game when I have all the bonuses though.

If its all econ, I would go with 2 farms, 2 entertainment, 3 factories and the rest banks or whatever. Later you can evaluate your morale situation and think about adding another farm (especially when you get stock markets).

First off, I always put my econ capital near my borders, as close to the middle of the map as possible- my trade ships reach their destinations faster.

If their are no farming bonuses, build two farms and morale improvement. At least 3 or 4 factories, and the rest econ improvements and the econ capital.

But if you have a bonus for research or influence, capitalize on that too.

I usually only build 0-1 farms with 1-3 entertainment buildings on each planet and run taxes in 80%+ with high approval. Usually keep approval around 80ish and start building another entertainment building on a planet if it starts to drop into the mid/low 70's since that gives it time to get built on slower/smaller planets before the approval drops too far. Usually run it that way since it gives me the leeway to jack taxes up to 90-100% in emergenceys for a few turns. Later when my planets are mostly built up though I'll generally wind up raising taxes to 100% range

population slum planets might of course get 2 farms, usually easier to just use planets with +farm tiles for those though. Researching upgraded farms from time to time usually is better than taking up space with extra farms though, especially when playing +20 research and technologist (another +20 research) since it's quickish.

I wouldn't have that many farms, I'd say one farm (of the best quality) is enough. I'd have
Initial Colony structure
4 Factories
1 Starbase
1 farm
1 entertainment
1 econ capital
rest trade

Not necessarily in that order

You might think it a bit strange to put an starbase on an economy capital, but if it's early in the game as you say, it might be worth having a starbase to give you an extra ship production centre. Once you get more shipyards up and running then you could upgrade one of the factories and the starbase to either stock markets or another farm and entertainment centre.

Oh and just nitpicking here too but it's spelt Capital, I see alot of people make that mistake on here for some reason.

soundz good to me

If you're evil, don't forget the mind control center. 100% bonus to economy, twice that of the economic capital.

You can go higher on the farms, but it does take a long time for the planet to fully develop that way. My max so far has been a bit over 60 billion people. No real issue keeping them in line since there were 42 tiles on the planet and plenty of development (class 26 base, +42% planet quality event = 36, +6 from terraforming = 42). IIRC there were 15x stock exchanges, 8x farms (I'd buy more as the pop grew), and around 10 virtual reality centers (probably more than I needed, even with my 69% tax rate). With the econ capital and mind control center, it was producing over 2k bc per turn, and still growing. And during most of that game, there was the "increased econ" event that pushed its income to around the 3.5k mark. I have the exact numbers written down somewhere, but can't find them at the moment.