This thesis attempts to measure the growth of the Bolivian informal sector. The study estimates the growth of the informal sector by defining it as the difference between the formal sector's reported real gross national product (GNP) and forecasted values of real GNP. The first chapter describes the Bolivian economy, defines its informal sector, and presents reasons for this sector's growth. Related research in informal activity, theoretical discussions, and perspectives are presented in the second chapter. Chapter III describes methodological research used in the analysis of the data. Chapter IV describes the results of the investigation. Conclusions and recommendations for the informal sector are provided in chapter V. The results show that it is possible to measure informal activity in a macro setting