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 4: Key features of the synthesis models

Norman C. Miller


Chapters 5 and 6 construct UIP synthesis models that are consistent with almost all of the 10 puzzling facts given in Chapter 1. This chapter carefully examines the key elements in the synthesis models. These are: (a) an intertemporal UIP framework; (b) the existence of a threshold magnitude or “risk premium”; (c) a finite speculative time horizon for carry-trade; (d) an exchange rate multiplier; (e) the anticipated value for the spot rate in the near future; and (f) the possibility of an inefficient fx market. When transactions costs are zero and if investors are risk-neutral (as in Chapter 3), they attempt to predict future interest rate differentials over an infinitely long time horizon. It is explained below that the existence of risk-aversion means that their speculative time horizon becomes finite, denoted by “n”, and is very likely to be far from infinite. Consequently, they form expectations about interest rate differentials over only the next “n” periods. That is: (a) n(t) is the speculative time horizon in period t; (b) n(t+1) is the speculative time horizon in period t+1; and (c) n(t+k) is the horizon for any period t+k. Investors also formulate expectations about the value for the spot rate “n” periods into the future. In period t, this is denoted by s*(t). That is, s*(t) represents what investors believe (as of period t) will be the value for the spot rate “n(t)” periods later in period t+n(t).

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