A survey conducted in Benin states that "the modern private sector cannot exist without the informal sector which, for some modern businesses, is their best customer" (Igue, 2008). The "informal" sector is not an economic sector in the usual sense of a set of "branches" of economic activity. It concerns all branches of the economy, including agriculture, finance, trade and health. It is a "parallel economy" but not separate, because its relations with the modern economy are many and complex.