Unconditionally optimal monetary policy

We develop a simple and intuitive approach for analytically deriving unconditionally optimal (UO) policies, a topic of enduring interest in optimal monetary policy analysis. The approach can be employed in both general linear-quadratic problems and in the underlying non-linear environments. A detailed example is provided using a canonical New Keynesian framework.     

On the robustness of simple and optimal monetary policy rules

This is a discussion of the paper “Simple versus Optimal Rules as Guides to Policy” by Brock, Durlauf, Nason and Rondina (BDNR) presented in November 2006 at Carnegie-Mellon University under the auspices of the Carnegie-Rochester Conference Series on Public Policy. I review the authors’ arguments, present a few suggestions for extension and outline where I think at least one strand of the literature should be heading.     

International dimensions of optimal monetary policy

This paper provides a baseline general equilibrium model of optimal monetary policy among interdependent economies with monopolistic firms and nominal rigidities. An inward-looking policy of domestic price stabilization is not optimal when firms’ markups are exposed to currency fluctuations. Such a policy raises exchange rate volatility, leading foreign exporters to charge higher prices vis-à-vis increased uncertainty in the export market. As higher import prices reduce the purchasing power of domestic consumers, optimal monetary rules trade off a larger domestic output gap against lower consumer prices. Optimal rules in a world Nash equilibrium lead to less exchange rate volatility relative to both inward-looking rules and discretionary policies, even when the latter do not suffer from any inflationary (or deflationary) bias. Gains from international monetary cooperation are related in a non-monotonic way to the degree of exchange rate pass-through.     

Capital controls and optimal Chinese monetary policy

China׳s external policies, including capital controls, managed exchange rates, and sterilized interventions, constrain its monetary policy options for maintaining macroeconomic stability following external shocks. We study optimal monetary policy in a dynamic stochastic general equilibrium (DSGE) model that incorporates these “Chinese characteristics”. The model highlights a monetary policy tradeoff between domestic price stability and costly sterilization. The same DSGE framework allows us to evaluate the welfare implications of alternative liberalization policies. Capital account and exchange rate liberalization would have allowed the Chinese central bank to better stabilize the external shocks experienced during the global financial crisis.     

Search and matching frictions and optimal monetary policy

A recent literature has merged the New Keynesian and the search and matching frameworks, which has allowed the former to analyze the joint dynamics of unemployment and inflation. This paper analyzes optimal monetary policy in this kind of hybrid framework. I show that zero inflation is optimal when all wages are Nash bargained in every period and the economy's steady state is efficient. In the more realistic case in which nominal wage bargaining is staggered, a case against price stability arises: in response to real shocks, the central bank should use price inflation so as to avoid excessive unemployment volatility and excessive dispersion in hiring rates. For a plausible calibration, the welfare loss under the zero inflation policy is about three times as large as under the optimal policy.     

Implications of habit formation for optimal monetary policy

We study the implications for optimal monetary policy of introducing habit formation in consumption into a general equilibrium model with sticky prices. Habit formation affects the model's endogenous dynamics through its effects on both aggregate demand and households’ supply of output. We show that the objective of monetary policy consistent with welfare maximization includes output stabilization, as well as inflation and output gap stabilization. We find that the variance of output increases under optimal policy, even though it acquires a higher implicit weight in the welfare function. We also find that a simple interest rate rule nearly achieves the welfare-optimal allocation, regardless of the degree of habit formation. In this rule, the optimal responses to inflation and the lagged interest rate are both declining in the size of the habit, although super-inertial policies remain optimal.     

RBA monetary policy communication: The response of Australian interest rate futures to changes in RBA monetary policy

This paper examines the Australian interest rate futures market reaction to changes in Reserve Bank of Australia (RBA) monetary policy. Having determined market expectations from 30-day Interbank futures, the study finds evidence that interest rate futures react strongly to target rate announcements across the maturity spectrum, with a stronger reaction evident in short maturity futures. Further, there is evidence of an asymmetric news effect whereby volatility reacts more strongly to bad news. Disaggregation of the market reaction into target- and path-surprise factors demonstrates that the change in market expectations of future target rates plays a significant role in explaining changes in yield, particularly for bond futures. There is strong evidence that monetary policy statements drive the path-factor, while the December 2007 modification in policy communication has improved the ability of the RBA to influence market expectations.     

Inventories and optimal monetary policy in a small open economy

We study how inventory investment affects the design of optimal monetary policy in a New Keynesian small open economy model. We find that under producer currency pricing, when the intratemporal elasticity of substitution is smaller than 1, optimal monetary policy in our model with inventories is similar to a standard model without inventories. However, when the intratemporal elasticity of substitution is larger than 1, inventory investment increases the importance of nominal exchange rate stabilization relative to a standard model without inventories. The importance of nominal exchange rate stabilization increases with the intratemporal elasticity of substitution.     

Robustly optimal monetary policy in a microfounded New Keynesian model

We consider optimal monetary stabilization policy in a New Keynesian model with explicit microfoundations, when the central bank recognizes that private-sector expectations need not be precisely model-consistent, and wishes to choose a policy that will be as good as possible in the case of any beliefs close enough to model-consistency. We show how to characterize robustly optimal policy without restricting consideration a priori to a particular parametric family of candidate policy rules. We show that robustly optimal policy can be implemented through commitment to a target criterion involving only the paths of inflation and a suitably defined output gap, but that a concern for robustness requires greater resistance to surprise increases in inflation than would be considered optimal if one could count on the private sector to have “rational expectations.”     

Wealth effects of open market operations and optimal monetary policy

Equilibrium models of the business cycle such as those developed by Lucas (1973) and Barro (1976), Barro (1980) are often used to analyze the effects of monetary disturbances on the economy. These models typically view monetary injections as arising through lump-sum transfer payments that are independent of an agent's holdings of money. This paper examines the effects caused by misperceptions about money for the more realistic case when money is injected through open market operations. The major result is that unperceived open market operations have a negative wealth effect.     

Innovation in monetary policy: Challenge and response

This paper presents some relatively non-technical thoughts on the changing rôle of money under the pressure of declining transactions costs and the innovations in monetary policy-making it induces or requires. In the first part, recent British experience is interpreted as a serious warning about the special rôle of money among financial assets under present-day circumstances and the high cost of disregarding it. While this may please the ‘monetarists’, the remainder of the paper argues, as a counterpoint, that this may not remain so forever. In particular, as argued in the second part, the evolution of the Eurodollar market suggests that the rôle of bank money and the significance of the money multiplier are declining. The third part visualizes the outlines of an economy in which the decline in transactions costs has made money stocks generally obsolete.     

On the joint determination of fiscal and monetary policy

The conduct of fiscal and monetary policy absent commitment depends on the interaction between the objective of smoothing distortions intertemporally and a time-consistency problem. When net nominal government obligations are positive, both fiscal and monetary policies are distortionary and the choice of debt depends on how the anticipated response in future monetary policy affects the current demand for money and bonds. There exists a unique steady state with positive net nominal government obligations, which is stable and time-consistent. For any initial level of debt, the welfare loss due to lack of commitment is small.     

The high-frequency response of exchange rates to monetary policy actions and statements

This paper investigates the impact of US monetary policy on the level and volatility of exchange rates using an event study with intraday data for five currencies (the US dollar exchange rate versus the euro, the Canadian dollar, the British pound, the Swiss franc, and the Japanese yen). I construct two indicators of news about monetary policy stemming separately from policy decisions and from balance of risk statements. Estimation results show that both policy decisions and communication have economically large and highly significant effects on the exchange rates, with the surprise component of statements accounting for most of the explainable variation in exchange rate returns in response to monetary policy. This paper also shows that exchange rates tend to absorb FOMC monetary surprises within 30-40 min from the announcement release.     

The role of liquidity constraints in the response of monetary policy to house prices

We analyse the optimal response of monetary policy to house prices in a New Keynesian framework. A positive wealth effect from housing is derived from liquidity constrained consumers. Housing equity withdrawal allows them to convert an increase in housing value into consumption and we show that monetary policy should react to house prices due to their effect on consumption by constrained agents. Moreover, we allow the share of liquidity constrained consumers to vary with house prices. Consequently, the optimal weights on expected inflation, the output gap and house prices in the optimal interest rate rule vary over time too.     

The cost of deviating from the optimal monetary policy: A panel VAR analysis

Exploiting the panel VAR GMM estimator's features, macroeconomic country factors are combined with micro-economic bank data to test for the risk taking channel in the Euro Area. According to prior expectations based on an extended DSGE model, the analysis demonstrates that the monetary policy incentives bank risk taking by increasing the bank leverage, but it is not able to influence the level of credit risk. However, deeper investigations indicates the Taylor gap adds to the bank risk appetite in all its forms, while regarding the reactions to target variables, movements in the interest rate smooth the bank risk.     

Intraday volatility responses to monetary policy events

This paper explores the effects of US monetary policy events on intraday volatility in the US equity markets. We examine Federal Open Market Committee (FOMC) announcements as well as real-time changes in market expectations about future policy announcements and their impact on the intraday volatility dynamics of the S&P 500 index. The analysis shows elevated intraday volatility following FOMC announcements through the market close, with a spike at the time of the announcement. We then differentiate the volatility spike by modeling an asymmetric response based on the direction of the actual target rate change. Our results suggest that the size of the volatility spike is dependent on the direction of the rate change, with expansionary monetary policy actions having a larger spike than contractionary policy actions. The duration of these volatility spikes is relatively short-lived, with the spike dampening out within 15 minutes. A more lasting impact is, however, documented for real-time changes in market expectations where the volatility spike tends to persist for at least one hour.     

Unconventional monetary policy and the spillovers to emerging markets

Unconventional monetary policy such as Quantitative Easing (QE) is often considered to have considerable spillover effects on emerging market economies (EME). Aims at quantifying these effects so far mostly use high-frequency data around announcement dates, panels or VAR models. This paper proposes an alternative way to estimate the effects of QE on emerging markets that allows us to include macroeconomic, i.e. low-frequency, data together with announcement dates. A Qual VAR is estimated that integrates binary information of QE announcements with an otherwise standard VAR, including US and emerging market variables. A key advantage is that the model accounts for the endogeneity and forecastability of QE announcements. The model uncovers the Fed's latent, unobservable propensity for QE and generates impulse responses for EME variables to QE shocks. The results suggest that QE has significant effects on EME's financial conditions and plays a sizable role in explaining capital inflows, equity prices and exchange rates.     

On the effectiveness of monetary policy under fixed rates of exchange

The IS-LM framework traditionally used to discuss the role of monetary policy under fixed rates of exchange has several weaknesses. The theoretical findings based on such a model cannot be accepted uncritically. The paper reassesses the role of monetary policy by appropriately modifying the IS-LM apparatus so that its resilts can be easier to compare with much of the existing literature. The meaning and effectiveness of monetary policy is analysed in short-run equilibrium, stock-flow equilibrium and full long-run equilibrium. Dynamical equations linking the short to the long run are specified. The notable implication is that monetary policy is effective in the short run and need not be ineffective in the long run. Complete emasculation of monetary policy occurs when the central authorities relinquish control over the flow distribution of government debt between money and bonds in favour of an independent use of a set of fiscal instruments. Perfect capital mobility requires that the central authorities decide whether monetary or fiscal policy become totally dependent on external forces. Whether one or the other is chosen is more a matter of specific circumstances than theoretical necessity. Critical comments are directed at the literature on offsetting capital flows.