This research aimed to identify and quantify the factors that encourage informality of MYPE, and as Informality affects the development of these, trying to measure the consequences for the small Peruvian businessman. It also sought to establish whether the entrepreneur decides to belong to the informal sector for reasons of escape or for reasons of exclusion. For such purposes This research has it developed from a descriptive and explanatory perspective in the District of Victor Larco of the Province of Trujillo in the field of business informality and how this becomes a determinant of sub economic development level small business, it is delimited by a quantitative nature. Informality advances in different sectors of the Peruvian economy, a correlational model was estimated to assess the impact of informality for informal MYPE, on variables that affect sales, costs, profit margins and ne...