Some authors argue that economic growth is a determinant of the level of performance and development of the financial system, because it detonates the necessities of financial services and funding for productive projects. On the contrary, some others have found evidence to state that financial markets development and performance explain, in part, the level of economic growth of a country. Through the estimation of a Vector Autoregressive and using data from the Mexican economy, it has been found in a previous work, that in the long run the performance of the stock market anticipates, partially, the real economic growth in the sense of the Granger causality. So, the purpose of this paper is to estimate a structural econometric model in order to include, in addition to the performance of the stock market, other determinants of the economic growth. This model enables the possibility to quantify the real impact of the performance of the stock market in the economic growth of Mexico. So, employing data from April of 2000 to August of 2010, it has been found that the influence of the Mexican Stock Market, in the economic growth of Mexico, is similar to the impact on the economy due to the reduction of the unemployment rate in the country. Moreover, the impact of this stock market on the economic growth is almost three times greater than the impact due to remittances, and significantly greater than the impact due to direct investment and due to balance of trade.