This study to analyze the importance of the purchase priceof shares in the financial result of a portifolio of investiments invariable in the long term. This subject ishighlighted in the internet channels that produce content aboutinvestiments and whose target audience is the small investor. TheMonte Carlo Method was used to estimate the average percentagereturn ofsmall investor who follows the strategy of, once a month and for a period of ten year,allocating capital in variableincome. The simulations were carried out based on the hsitoricalseries of the Bovespa Index and the comparison metric adoptedwasthe maximum return for the period. In the simulation periods,the difference between the average return and the maximum return was less than 10% (equivalent to less than 1% per year)