A dynamic pricipal-agent problem as a feedback Stackelberg differentioal game

We consider situations in which a principal tries to induce an agent to spend e®ort on accumulating a state variable that a®ects the well-being of both parties. The only incentive mechanism that the principal can use is a state-dependent transfer of her own utility to the agent. Formally, the model is a Stackelberg di®erential game in which the players use feedback strategies. Whereas in general Stackelberg di®erential games with feedback strategy spaces the leader's optimization problem has non-standard features that make it extremely hard to solve, in the present case this problem can be rewritten as a standard optimal control problem. Two examples are used to illustrate our approach.

Non-neutrality of economic policy: An application of the Tinbergen-Theil’s approach to a strategic context

Issues of policy effectiveness and neutrality are widespread in the economic literature. They have been increasingly raised in specific contexts within the class of LQ (linear-quadratic) policy games in the last 20 years, notably with reference to monetary policy. The more general conditions ensuring nonneutrality in a strategic environment remain however to be inquired. We fill this gap by applying the classical theory of economic policy to a strategic context. This is also useful to highlight some existence conditions for policy game solutions. We restrict ourselves to the common LQ-games in a static perfect information framework, but our simple logic can be extended to other more general situations.LQ-policy games, policy ineffectiveness, controllability.

NON-NEUTRALITY OF MONETARY POLICY IN POLICY GAMES

The main aim of this article is to investigate the sources of non- neutrality in policy games involving one or more trade unions. We use a simple set up in order to clearly expose the basic mechanisms that also work in more complex frameworks. We show that there are common roots in the nonneutrality results so far obtained in apparently different contexts as, e.g., an inflation-averse union playing against the government; a union sharing some other common objective with a policy maker; or when more than one union interacts with monopolistic competitors in the goods market and a policymaker. We finally show that there are other cases where the nonneutrality result can arise.neutrality, money, unions, policy game.

Non-neutrality of monetary policy in policy games

The main aim of this article is to investigate the sources of non- neutrality in policy games involving one or more trade unions. We use a simple set up in order to clearly expose the basic mechanisms that also work in more complex frameworks. We show that there are common roots in the non-neutrality results so far obtained in apparently different contexts as, e.g., an inflation-averse union playing against the government; a union sharing some other common objective with a policy maker; or when more than one union interacts with monopolistic competitors in the goods market and a policymaker. We finally show that there are other cases where the non-neutrality result can arise.neutrality, money, unions, policy game

Difference games and policy evaluation: A conceptual framework

Economics

Controllability and non-neutrality of economic policy: The Tinbergen’s approach in a strategic context

In the last 20 years issues of policy effectiveness and neutrality (notably with reference to monetary policy) have been increasingly raised in the context of static LQ (linear-quadratic) policy games. The general conditions ensuring policy non-neutrality in a strategic environment remains however to be inquired. We state these conditions by generalizing the classical theory of economic policy developed by Tinbergen and others to such a context. We also state necessary and sufficient conditions for the existence of Nash and Stackelberg equilibria. We finally show that the conditions for monetary policy effectiveness asserted in the literature respect our general conditions.LQ-policy games, policy ineffectiveness, static controllability

Policy Uncertainty, Symbiosis, and the Optimal Fiscal and Monetary Conservativeness

This paper extends a well-known macroeconomic stabilization game between monetary and fiscal authorities introduced by Dixit and Lambertini (American Economic Review, 93: 1522-1542) to multiplicative (policy) uncertainty. We find that even if fiscal and monetary authorities share a common output and inflation target (i.e. the symbiosis assumption), the achievement of the common targets is no longer guaranteed; under multiplicative uncertainty, in fact, a time consistency problem arises unless policymakers� output target is equal to the natural level.Monetary-fiscal policy interactions, uncertainty, symbiosis.

Expectations Traps and Coordination Failures: Selecting among Multiple Discretionary Equilibria

Discretionary policymakers cannot manage private-sector expectations and cannot coordinate the actions of future policymakers. As a consequence, expectations traps and coordination failures can occur and multiple equilibria can arise. To utilize the explanatory power of models with multiple equilibria it is �first necessary to understand how an economy arrives to a particular equilibrium. In this paper, we employ notions of learnability, self-enforceability, and properness to motivate and develop a suite of equilibrium selection criteria. Central among these criteria are whether the equilibrium is learnable by private agents and jointly learnable by private agents and the policymaker. We use two New Keynesian policy models to identify the strategic interactions that give rise to multiple equilibria and to illustrate our equilibrium selection methods. Importantly, unless the Pareto-preferred equilibrium is learnable by private agents, we �find little reason to expect coordination on that equilibrium.Discretionary policymaking, multiple equilibria, coordination, equilibrium selection