1. This definition of perfect capital mobility corresponds with the one presented in Dornbusch and Krugman (1976), p. 554. Some authors understand by perfect capital mobility both continuous equilibrium and perfect substitutability between domestic and foreign bonds (see e.g. De Haan et al., 1979, p. 331 and MacDonald, 1988, pp. 33 and 34).
2. Obstfeld and Stockman (1985, esp. pp. 954–957) show that when the menu of assets is expanded, the current account, per se, may play no role in exchange rate dynamics.
3. These models are unstable, see for instance Ethier (1979), Gray and Turnovsky (1979) and Kouri (1976). The instability problem can be solved by introducing a so-called transversality condition. An economic interpretation of this condition can be found in Kouri (1976).
4. The number of publications containing tests on the existence of a risk premium in the foreign exchange market is enormous. Surveys can be found in Levich (1985) and Hodrick (1987).
5. Note that some authors refer to these single equation models as “structural models”. With this term they want to differentiate these models from the pure time series models which explain the exchange rate’s current value only from past observations of its own time series. From an econometric point of view the term “structural models” is deceptive, because these equations are not the model’s structural form.