Ciudad - History

History

Further information: Historical cities and List of largest cities throughout history

Towns and cities have a long history, although opinions vary on whether any particular ancient settlement can be considered to be a city. A city formed as central places of trade for the benefit of the members living in close proximity to others facilitates interaction of all kinds. These interactions generate both positive and negative externalities between others' actions. Benefits include reduced transport costs, exchange of ideas, sharing of natural resources, large local markets, and later in their development, amenities such as running water and sewage disposal. Possible costs would include higher rate of crime, higher mortality rates, higher cost of living, worse pollution, traffic and high commuting times. Cities will grow when the benefits of proximity between people and firms are higher than the cost.

The first true towns are sometimes considered to be large settlements where the inhabitants were no longer simply farmers of the surrounding area, but began to take on specialized occupations, and where trade, food storage and power was centralized. In 1950 Gordon Childe attempted to define a historic city with 10 general metrics. These are:

1. Size and density of the population should be above normal.
2. Differentiation of the population. Not all residents grow their own food, leading to specialists.
3. Payment of taxes to a deity or king.
4. Monumental public buildings.
5. Those not producing their own food are supported by the king.
6. Systems of recording and practical science.
7. A system of writing.
8. Development of symbolic art.
9. Trade and import of raw materials.
10. Specialist craftsmen from outside the kin-group.

This categorisation is descriptive, and it is used as a general touchstone when considering ancient cities, although not all have each of its characteristics.

One characteristic that can be used to distinguish a small city from a large town is organized government. A town accomplishes common goals through informal agreements between neighbors or the leadership of a chief. A city has professional administrators, regulations, and some form of taxation (food and other necessities or means to trade for them) to feed the government workers. The governments may be based on heredity, religion, military power, work projects (such as canal building), food distribution, land ownership, agriculture, commerce, manufacturing, finance, or a combination of those. Societies that live in cities are often called civilizations.