HOW TO GET TRADE

You get one point of trade when you put people to work on:

grassland with a road
plains with a road
desert with a road
river (no road needed, thus good spot to start new cities)

Two points for people working on an ocean sector. I forget the exact
number six or seven for a gold sector and four or five for a gem sector.

GOVERNMENT EFFECTS ON TRADE

If your government type is Republic or Democracy you get an additional
point of trade for each sector that has trade. Most of your trade will
come from plains and grassland, so if you have Republic or Democracy your
trade will be much much higher than other forms of government. (On the
down side it is harder to wage war if you are a Republic or Democracy,
but that is another topic)

All government types have corruption except democracy. Which means the
farther a city is from the capital the more trade is reduced. Corruption
can be seen as black trade makers in the city production screen. An
exception is communism whose corruption is always one, no matter how far
from the capital.

HOW CITY IMPROVEMENTS EFFECT TRADE

All the effects are only for the city with the improvement.
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