I will be returning to the markets in Peru in August 2016.  Below you can find my thesis from my experience in the Gamarra Market and Villa el Salvador and Maria del Triunfo in 2013.

Economic informality is the biggest obstacle in Peru’s formal business environment, particularly for its largest actors: micro, small, and medium enterprises (MSMEs). As such, current levels of

informality threaten the sustainability of Peru’s formal labor force and enterprises. Two case studies of the most important hybrid clusters, The Gamarra Market and Villa el Salvador and Villa Maria del Triunfo, in Lima illustrate the ways in which the increasing trend towards greater informality impedes entrepreneurial competitiveness. Financial Inclusion forms the basis for a gradual, dynamic conversion to full economic citizenship.

This thesis finds that there is a unique opportunity to build formal relationships between those in the informal sector and formal financial institutions through mobile technology. Mobile financial ecosystems can allow for sectoral strategies to not only achieve financial inclusion but also promote and incentivize economic formalization in the long-term. 

2013 Thesis from Georgetown School of Foreign Service Center for Latin American Studies Library:

A Reassessment of the Driver's of Economic Informality: Opportunities in Mobile Technology