In the present investigation it has been evaluated the Public investment and their incidence in the level of economic activity, with the purpose of contributing in the knowledge of the importance that is the public investment for our economy, with an eye toward improving the process of taking of economic politics's makers' decisions. It has been examined the bills of the public sector and of the central government of the registrations statistical quarterly that reports the Central Bank of Reservation of the Peru, such as the average expenses and the expenses in public investment, the statistics were also revised in periods quarterly of the PBI reported by the National Institute of Statistic and Computer, these variables were analyzed through the descriptive statistic. Soon after he/she was considered the following econometric model: PBI = β1 + β2 Public Investment + εt. It was found t...