The FEER focuses on long-run determinants of the RER, rather than on short-term cyclical and speculative forces. It represents a RER consistent with macroeconomic balance, characterized by the achievement of internal and external balances at the same time. Internal balance is reached when the level of output is in line with both full employment of all available factors of production, and a low and stable rate of inflation. On the other hand, external balance holds when actual and future CA balances are compatible with long-term sustainable net capital flows. Nevertheless, the FEER is viewed as a normative measure of the RER since it is based on some “ideal” economic conditions related to internal and external balances. Particularly, since the sustainable CA position is defined as an exogenous value, this approach has been broadly questioned over time.