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Tarquinius
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it works like this:
Every city you own 'produces' at least one commerce, from its own square. Most cities produce more of course, because its citizens are working on tiles with a road, a river or/and a special resource.
All your cities together collect a certain amount of commerce.
Then you can choose hom much of this commerce you want to use for tax, luxuries and science
An example to make clarify this:
Suppose all your cities together produce 100 commerce.
If you use 50% from this for science, and 50% as tax, you would gain 50 'lightbulbs' (you can see them in your city screen)
The more lightbulbs you have, the quicker research will go.
You can boost your amount of lightbulbs by building libraries and universities, by transforming some of your citizens in scientists, wich produce one lightbulb each or by raising your civilizations science rate.
But before you can use these 100 commerce, corruption comes into play. If 50 of your 100 commerce points are corrupted, you only have 50 commerce points to devote to science, tax and luxuries.
You probably noticed some techs go faster than others; not all techs cost the same. But still: the more lightbulbs, the faster science will go (unless you reach the absolute minimum of turns, which is 4 turns if you haven't edited it)
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