“A way of living of individuals, families (households), and societies, which they manifest in coping with their physical, psychological, social, and economic environments on a day-to-day basis.”(businessdictionary.com)

The massive urban migration that began in the 1950s saw a middle class emerge, resulting in a three-class system: upper, middle, and lower. The upper class, which includes 20 percent of the population, accounts for about 75 to 80 percent of the gross national product. This group tends to be made up of individuals of unmixed European ancestry. Within this class, there is an elite referred to as the "oligarchy" that enjoys wealth and financial security, political power, and education. This group may be considered a caste, since membership is largely due to birthright, not to individual ability. A wide gap separates the elite from the masses. Unlike the elite, this group has few opportunities for social mobility. Social inequality is evident in the lower class, whose members are often malnourished, poorly housed, disease-ridden, and illiterate.