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This paper places Kydland and Prescott's classic analysis of time inconsistency in a fuller context by examining their result in five different economic environments. Pedagogically, the paper uses a consistent mathematical treatment of the subject throughout. To understand the motivations of the central bank, the paper begins with the environment that Kydland-Prescott successfully criticized wherein the public has static inflationary expectations and the central bank assumes that they do. The main sections of the paper go on to analyze time inconsistency in four alternative environments defined by the belief structure of the central bank with respect to the nature of the economy and the mechanism by which the public forms its inflationary expectations. It is shown that the inconsistency result holds when the central bank does not understand the natural rate hypothesis and does not believe that the public forms their inflationary expectations rationally. The inconsistency result, however, does not hold in the other cases.

This paper analyzes dynamically inconsistent time preferences in Rubinstein's (1982) seminal model of bargaining. When sophisticated bargainers have time preferences that exhibit a form of present bias -satisfied by the hyperbolic and quasi-hyperbolic time preferences increasingly common in the economics literature- equilibrium is unique and lacks delay. However, when one bargainer is more patient about a single period's delay from the present than one that occurs in the near future, the game permits a novel form of equilibrium multiplicity and delay. Time preferences with this property have most recently been empirically documented; they can also arise when parties who weight probabilities non-linearly bargain under the shadow of exogenous breakdown risk, as well as in settings of intergenerational bargaining with imperfect altruism. The paper's main contributions are (i) a complete characterization of the set of equilibrium outcomes and payoffs for separable time preferences, and (ii) present bias as a readily interpretable sufficient condition for uniqueness at the level of individual preferences. (author's abstract)

This paper analyzes the effectiveness of delegation in solving the time inconsistency problem of monetary policy using a microfounded general equilibrium model where delegation and reappointment are explicitly included into the government's strategy. The method of Chari and Kehoe (1990) is applied to characterize the entire set of sustainable outcomes. Countering McCallum's (1995) second fallacy, delegation is able to eliminate the time inconsistency problem, with the commitment policy being sustained under discretion for any intertemporal discount rate.

This paper analyzes the effectiveness of delegation in solving the time inconsistency problem of monetary policy using a microfounded general equilibrium model where delegation and reappointment are explicitly included into the government's strategy. The method of Chari and Kehoe (1990) is applied to characterize the entire set of sustainable outcomes. Countering McCallum's (1995) second fallacy, delegation is able to eliminate the time inconsistency problem, with the commitment policy being sustained under discretion for any intertemporal discount rate.

Time-inconsistency can arise when a government attempts to convince private sector to use a particular alternative energy (gas, green electricity.) rather than petroleum products. By introducing taxes and feed-in prices, a government would encourage firms and households to switch to an alternative energy rather than use petroleum products. However, even if a government is in favor of increasing alternative energy consumption, it can benefit from considerable financial resources resulting from petroleum product consumption. As a result of these conflicting issues, the private sector may not find the alternative energy policy credible, which prevents the government to implement a socially efficient policy