The Mexico City region accounts for nearly one-fourth of the gross domestic product of Mexico. More than three-fourths of the district’s income derives from the service sector, and about one-fourth derives from manufacturing. The vast majority of the metropolitan area’s income and employment also derives from services, followed by manufacturing. México state is the economic backbone of the surrounding area, and its economy ranks second only to the Federal District on a national scale.
The informal sector of the economy, which helps compensate for high official unemployment rates, is difficult to quantify but is undeniably widespread in the capital. It is evidenced in the squadrons of shoeshine boys, mobile candy-and-gum sellers, garbage scavengers, day labourers, street performers, and others whose income is generally underreported to taxing authorities. As is also true in Europe and the United States, many residents of the city are employed in informal jobs hidden beyond ordinary sight, including those working as live-in maids and unlicensed child-care providers, as well as those engaged in more nefarious pursuits, such as drug dealing, prostitution, and black marketeering.
Agriculture and mining together account for only a tiny percentage of the metropolitan workforce. However, dairy products, corn (maize), maguey (agave, the source of pulque), and other farm products are sold in urban markets. The demands for food, water, and fuel for an urban settlement the size of Mexico City are staggering. All of these supplies are brought in from increasingly distant places. A single orange or beefsteak may have to travel more than 100 miles (160 km) to reach a household in the city. Tens of thousands of tons of food alone must arrive daily in order to meet demands. "Mexico" © Emmanuel BUCHOT, Encarta, Wikipedia
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