Exchange Rate Economics
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Exchange Rate Economics

The Uncovered Interest Parity Puzzle and Other Anomalies

Norman C. Miller

The Uncovered Interest Parity (UIP) puzzle has remained a moot point since it first circulated economic discourse in 1984 and, despite a number of attempts at a solution, the UIP puzzle and other anomalies in Exchange Rate Economics continue to perplex economic thought in international finance. This fundamental book fill gaps in scholarly literature by amalgamating key discourse to generate synthesis models which appear consistent with the UIP puzzle and related anomalies, uniquely bringing them together in one place. Through a comprehensive and current review of the literature, Norman C. Miller reveals new explanations for exchange rate anomalies and offers an alternative approach towards the UIP puzzle, stimulating and guiding future research.
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Chapter 5: Synthesis Model I

Norman C. Miller


Synthesis Model I, in this chapter, and Synthesis Model II in Chapter 6 differ according to whether: (a) carry-trade occurs until investors believe that ex ante UIP holds at the end of each period; or (b) ex ante UIP does not hold. Synthesis Model II is more general because it reduces to Synthesis Model I as the fx market approaches perfect efficiency. However, Synthesis Model I is useful because the fx market might very well be highly efficient at times, and because it provides insights into the workings of the fx market that are relevant in Synthesis Model II. This chapter uses much of the material from Chapter 4 to develop Synthesis Model I, which represents an intertemporal UIP framework wherein investors believe that ex ante UIP holds at the end of each time period. It allows for the possibility that expectations about future interest rates are, at times, incorrect. It is shown that this does not necessarily imply that investors violate Muth Rationality in the long run. The main thrust of research on the UIP puzzle deals with: (a) a variable “risk premium” that is appropriately correlated with the interest rate differential (ID); (b) exchange rate expectations errors that are appropriately correlated with ID; and/or (c) fx market inefficiency. This chapter formally includes (a) and a variant of (b). It investigates the conditions under which ex post UIP might be violated. Also, it shows that Synthesis Model I is consistent with eight of the ten puzzles given in Chapter 1.

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