The term structure of interest rate differentials is derived in a model of a small open economy with a target-zone exchange rate regime. The target zone is modelled as a regulated Brownian motion. The interest rate differentials are computed as the solution to a parabolic partial differential...

Under the assumption of no arbitrage, exchange rate target-zone credibility is tested by whether domestic interest rates fall within `rate-of-return bands' between the maximum and minimum home-currency rate of return on a foreign investment in the absence of a devaluation. Under the assumption...