The present study analyses the behaviour of brazilian investors in different interest rate environments and compares this behaviour with traditional theory of finance and behavioural finance. In addition to quantitative data available from the Brazilian capital market, the study develops a qualitative, observational field research – authored by the authors. The field research seeks to adapt the work of Yoav Ganzach and Avi Wohl (2018) A Behavioral Theory of the Effect of the Risk-Free Rate on the Demand for Risky Assets that suggests that lower interest rates change investors propensity to take risk. This type of approach goes against what the classical microeconomy suggests, according to which, what matters is the risk premium, or the higher return to risk-free return. Put another way, according to classical literature, the level of risk-free return does not matter. The present work reproduces experiments in the Brazilian market to understand whether risk premium is a relevant variable or if the level of interest changes the way of investing. In addition, the paper seeks to understand whether there is a distinction between retail and high-income investors.