From LIP: http://www.livinginperu.com/news/13399
About 16.8 million of Peruvian citizens, or 57 percent of Peru’s population, are considered middle class, according to a study by Santander Group.
The research also indicates that among Latin American countries, Peru ranks seventh based on the percentage of its middle class population. However, with Brazil, Chile and Colombia, Peru has been one of the Latin American nations with the greatest expansion of this socio-economic sector in the last decade.
The Santander Group also reports that in 1990, 53 percent of Latin Americans belonged to this socioeconomic segment while in 2010 the rate is 65 percent.
It makes you wonder if the 57% of middle class Peruvians live in Lima or if they are evenly disbursed? I doubt that the Amazonas and Andean Highlands (i.e. Ayacucho, Apurimac) even figure significantly into these percentages.
I'm also under the persuasion that these figures are inflated due to credit. I doubt that 57% of Peru's middle class qualify under this category due to their liquid assets (i.e. CASH).