What is considered being middle class in Mexico?

Given our post More Mexicans Leaving Than Coming to the U.S., someone suggested that the growth of middle class in Mexico might be a reason. 

Before jumping to conclussions, what does it means to be middle class in Mexico?

A member of the middle class should meet some of these criteria:
Can afford to send one or more children to University and pay for their child's room, board, and expenses outside of the home.
Works as a licensed professional (Licenciado)
Lives in a good neighborhood
Owns a car less than 5 years old
Owns a successful business, or works in management of a successful business
Can afford to vacation in places where no family members are residents

Salary ranges vary according the region where the family lives, since living wages are very different between states in Mexico, also, note that credit card use is more a luxury than a commodity in Mexico, however, store credits are very easy to obtain.

Truth is, there are several studies that suggest that middle class is dissapearing in Mexico, leaving a gap between low and high economical segments of population. 

Where do you read us from? What do you consider middle class?

More Mexicans Leaving Than Coming to the U.S.

Family reunification, Top reason for return

More Mexican immigrants have returned to Mexico from the U.S. than have migrated here since the end of the Great Recession, according to a new Pew Research Center analysis of newly available government data from both countries. The same data sources also show the overall flow of Mexican immigrants between the two countries is at its smallest since the 1990s, mostly due to a drop in the number of Mexican immigrants coming to the U.S.

From 2009 to 2014, 1 million Mexicans and their families (including U.S.-born children) left the U.S. for Mexico, according to data from the 2014 Mexican National Survey of Demographic Dynamics (ENADID). U.S. census data for the same period show an estimated 870,000 Mexican nationals left Mexico to come to the U.S., a smaller number than the flow of families from the U.S. to Mexico.

Measuring migration flows between Mexico and the U.S. is challenging because there are no official counts of how many Mexican immigrants enter and leave the U.S. each year. This report uses the best available government data from both countries to estimate the size of these flows. The Mexican data sources — a national household survey, and two national censuses — asked comparable questions about household members’ migration to and from Mexico over the five years previous to each survey or census date. In addition, estimates of Mexican migration to the U.S. come from U.S. Census Bureau data, adjusted for undercount, on the number of Mexican immigrants who live in the U.S. 

450 pork tamales from Mexico seized at LAX

A passenger arrived from Mexico on Nov. 2 and was stopped by U.S. Customs and Border Protection agriculture specialists, who found 450 pork tamales wrapped in plastic bags in the passenger’s luggage. S/he apparently denied that the tamales were made with pork, which is on the list of products that travelers may not bring into the country under customs regulations. 

The passenger would have been in the clear had he tried to bring sweet tamales – or those all masa ones that always seem to be left over. But bringing pork from another country into the United States carries potentially serious health risks, according to Customs and Border Protection.

“Although tamales are a popular holiday tradition, foreign meat products can carry serious animal diseases from countries affected by outbreaks of Avian influenza, mad cow and swine fever,” an agency’s acting field operations in Los Angeles, said in a statement.