Thesis this work has been done in the city of Huamachuco, La Libertad, Peru. Its aim head m s that way support the Strategy Product Mix influences the Market Performance libraries Huamachuco, which has played a satisfaction. In reviewing the problematic reality, it has formulated the research question: How does Strategy Product Mix influences the Market Performance Libraries Huamachuco, 2015?. For data collection have been taken into account two populations: 11 workers and 942 client’s bookstores study; of them they have extracted samples of 11 workers and 87 clients respectively. They have been implemented customer surveys and workers have conducted interviews with representatives of bookstores. With the results obtained, and according to the scientific method has been carried out the analysis and discussion corresponding coming to demonstrate the validity of the hypothesis which stat...