Can I ask you to clarify? Are you suggesting that if I run 100% science slider on Deity, I'm NOT getting one beaker per commerce ???
My understanding is that it is always one-for-one at 100% slider, and maintenance is a gold cost not related to commerce, but instead to city size / number / distance etc...?
I think I was going out of topic, sorry about this.
I'm not going any further. My point was just that 300 commerce empire wide isn't exactly extraordinary. Sorry for taking 3 lenghty posts to say this.
To answer this as fast as possible, it's about building all modifiers.
At settler you can pretty easily build libraries, universities, ... all around the place.
At deity, you'd better build some units.
This was my idea, just to clarify. Maybe some don't agree, but please don't continue off topic.
Cabert,
I don't think you're looking at this the right way. If you give up 6 commerce for the sake of 6 beakers, the city gains some beakers and loses some gold. You must make up the lost gold in your other cities by dropping the slider slightly. This loses you some beakers in your other cities.
The reason I was talking about your 'best science multiplier cities' is because if your local beaker to gold ratio is higher than your empire-wide ratio, then the beakers gained directly are greater than those lost to the lower slider. Likewise, if a city's local ratio is lower than average, you prefer gold to an equal amount of beakers or commerce. If a city is completely average (like if you have the same multipliers in every city) commerce, beakers, and gold are equally valuable.
About me looking at it the wrong way, I guess you're using the wrong vocabulary.
Commerce is the base thing. It gets divided into gold, beakers, culture and espionnage.
I'm not giving up commerce for beakers. I may be giving up gold for beakers, if I have enough options to get gold from :
1) selling techs
2) building gold
3) asking politely my friends
4) pillaging.
Are commerce, gold and beakers equally valuable? No, not at all. Never.
If you want to run for cultural, you can use 1 commerce to get 3 or 4 cpt. You cannot use gold for this, nor can you use beakers for it.
You have numerous options to get the gold for funding your empire and run culture as high as possible.
Settling a few great artists can be enough at lower levels (low maintenance).
OTOH, when you're running for space, you don't care about gold. You need the techs.
If you're trying for domination, you need money for $rushing more than tech.
My way to look at it is to focus on what you need most. Running 100% gold to 2 turns before you finish the laboratories (andd possibly $ rushing the labs) is certainly a way of getting more beakers.
About multipliers, you're totally right. That's why there are gold specialized cities, and science specialized cities in the end game. Merchants assigned in gold cities, scientists assigned in science cities.
One small note about this : in vanilla, you get 1
base gold for 2
base hammers when you build gold.
In Warlords and BtS, you get 1 final gold for 2 final hammers.
Meaning that in vanilla you really should build gold in cities with markets, grocers, banks, while in warlords and BtS, you should build gold in cities with forges, factories, power, ...