goods, cash, and new ideas. Your policies can adjust how trade is
divided among luxury goods, cash, or research. There may be times when a
city requires more luxury goods to make more people happy, or times when
more tax revenues are needed in the treasury. Higher taxes mean more
revenue but may result in more people becoming unhappy.

As your cities grow they may require more care in keeping them
productive. Large cities are desirable for production, but have inherent
problems. A critical one you must deal with is the happiness of the
population. The people can range from happy, to content, to unhappy.
Having too many unhappy people may lead to revolt.

Luxury goods make people happy but mean fewer tax revenues or a
reduced flow of technology. By adjusting the flow of luxuries, changing
types of government, building city improvements, instituting martial
law, and other means, it is possible to keep even the largest city
content and productive.

TECHNOLOGY is a second concept fundamental to CIVILIZATION. To
make the transition from wandering hunter-gatherers to city dwellers,
humankind had to possess some essential knowledge and skills. To advance
beyond the first stages of city dwelling requires a corresponding
advance in knowledge.

At the start of CIVILIZATION, with your tribe poised on the
threshold of history, they already possess some basic knowledge. The
people understand agriculture, irrigation, construction of roads, and
the construction of homes and other buildings. But this isn't enough
knowledge to survive through the coming ages. Learning new technologies
opens the door to new abilities. A small island-bound civilization that
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