d) The amounts of the different financial assets available risk you are fixed as an exogenous variable in the model, i.e. the supply of financial assets is given; besides, they are considered marketable, perfectly divisible and shall not dividends, but simply capital gains. e) It is possible to invest in a risk-free asset with zero net supply and whose performance (RF) can be requested and granted unlimited resources. f) The market is perfectly competitive, i.e., no investor is sufficiently important to influence business sufficient asset prices. In addition, there are no frictions in the market or transaction costs or capital tax. g) The financial market is informationally efficient, which signifies that the market price action represents the consensus of the market about the value of the action. This means that prices reflect all available information on both the economy and the stock market as on the particular company. The first three cases show us the way in which individuals choose their portfolios, the next two states that all decisions are taken at the same time and for the same period, while the latter respectively standardize the frame surrounding the decision, efficiency market and assessments made by investors about the various combinations of expected return and risk of their investments. These assumptions are based on factors that make up the CAPM (separation theorem, Capital Market Line and Line stock market) and which are explained below. 2.2.2. Assumptions of CAPM Model CAPM assumptions described an extreme situation. The model is based on the capital market is perfect, and there are no restrictions that prevent the participation of investors. This model is developed in a hypothetical world where the following assumptions about investors and the set of opportunities of an investment portfolio are made: 1. Investors are individuals who are risk averse and seek to maximize the expected util>