Markets are a source of income for your empire. The more markets, the less
Mines are a source of income for your empire. The more mines, the less
Tourism is a source of income for your empire. The more tourist sites,
the less their profits.
Industry produces your War machines. They are useful for building up your
defense while you worry about other things. They are generally more
advantageous in the latter times, because the prices have risen, and your
production does not decrease. Also, industry will use unused production
capacity to produce money. This is useful in times of crisis.
Cities encourage people to move to your empire. People will travel from
various places to come and live in your empire, which will enable you to
earn taxes from them.
Farms are your source of food. Empires can either have their own food, or
buy from the common market, but the market is much less reliable, as it is