The real Brazilian tributary system presents a series of problems and despite everybody knows that a changing is necessary, it was not yet done. A lot of efforts is realized trying to evaluate the impacts of different proposals of tributary system alteration but their results are not persuasive...

In the last two decades the financial integration between countries arose. In consequence appeared questions on different degrees of autonomy of monetary politics of these countries. The traditional sight is that interest rate is determined by offer and demand of loaned funds and that the...