On the Sources of Inflation in Kenya: A Model‐Based Approach

We develop a semi‐structural new‐Keynesian open‐economy model – with separate food and non‐food inflation dynamics to study the sources of inflation in Kenya in recent years. To do so, we filter international and Kenyan data (on output, inflation and its components, exchange rates and interest rates) through the model to recover a model‐based decomposition of most variables into trends (or potential values) and temporary movements (or gaps) – including for the international and domestic relative price of food. We use the filtration exercise to recover the sequence of domestic and foreign macroeconomic shocks that account for business cycle dynamics in Kenya over the last few years, with a special emphasis on the various factors (international food prices, monetary policy) driving inflation. We find that while imported food price shocks have been an important source of inflation, both in 2008 and more recently, accommodating monetary policy has also played a role, most notably through its effect on the nominal exchange rate. We also discuss the implications of this exercise for the use of model‐based monetary policy analysis in sub‐Saharan African countries.     

Economic Globalization and Inflation in China: A Multivariate Approach

This paper evaluates whether globalization has increased the role of global factors in driving inflation in China. Unlike other published studies on the relationship between globalization and inflation, which mostly use Phillips curve models, this paper uses multivariate dynamic models to examine the dynamic interactions between globalization and inflation in China. Empirical results with quarterly data spanning from 1995 to 2012 show that the global output gap significantly affects the dynamics of inflation in China. In particular, the global output gap is superior to the domestic output gap in predicting domestic inflation. Impulse response and variance decomposition analyses reinforce this finding. Our results indicate that the central bank of China should take developments in global output into account in its monetary policy‐making process.     

AN OPEN ECONOMY NEW KEYNESIAN DSGE MODEL OF THE SOUTH AFRICAN ECONOMY

In this paper an open economy New Keynesian model of the South African economy is presented. The model is constructed to provide for incomplete pass-through of exchange rate changes, external habit formation, partial indexation of domestic prices and wages to past inflation, and staggered price and wage setting. Furthermore, the model is estimated using Bayesian techniques on South African domestic and trade partner data for the period 1990Q1 to 2007Q4. The estimated model is analysed by means of impulse response functions.     

Why is Inflation in China a Monetary Phenomenon？

This paper proposes that inflation in China during the post‐reform era (1978 onwards) is always a monetary phenomenon. We construct a multivariate dynamic model based on Friedman's quantity theory of money and use the standard Granger causality test to show that money growth contains significant predictive power for inflation during the underlying period. The finding is robust to alternative measures of monetary aggregates and both closed and open economy frameworks. The baseline finding of the paper indicates that quantitative tools remain the most important policy instruments for China to manage its inflation effectively.     

The gain from commitment in a two-country economy with inflation persistence

In recent years, the worldwide inflation rate appears to be converging to a low stable level. Moreover, the Phillips curve is flattening in many countries. These facts indicate that the output gap fluctuations associated with inflation persistence in one country influence other countries and suggest that the central bank consider the effect of inflation persistence on the real economy in an open economy framework. The objective of this paper is to explore optimal monetary policy in a two-country economy with inflation persistence. To consider the case in which inflation persistence is present in both countries, we assume that a fraction of firms that change their prices follows the rule-of-thumb pricing rule. In this case, the new Keynesian Phillips curve (NKPC) in each country becomes flatter as the fraction of firms employing the rule-of-thumb pricing rule increases in both countries. Our results show gains from commitment in a two-country economy with inflation persistence. This paper addresses that the presence of a severe deflationary bias is the main source of the large gain from a commitment policy in a two-country economy with inflation persistence.     

The New Keynesian Phillips Curve and Lagged Inflation: A Case of Spurious Correlation?

The New Keynesian Phillips Curve (NKPC) specifies a relationship between inflation and a forcing variable and the current period's expectation of future inflation. Most empirical estimates of the NKPC, typically based on generalized method of moments (GMM) estimation, have found a significant role for lagged inflation, producing a “hybrid” NKPC. Using U.S. quarterly data, this article examines whether the role of lagged inflation in the NKPC might be due to the spurious outcome of specification biases. Like previous investigators, we employ GMM estimation and, like those investigators, we find a significant effect for lagged inflation. We also use time varying coefficient (TVC) estimation, a procedure that produces consistency under a variety of sources of misspecification. Using two separate measures of expected inflation, we find strong support for the view that, under TVC estimation, the coefficient on expected inflation is near unity and that the role of lagged inflation in the NKPC is spurious.     

European Inflation and the New Keynesian Phillips Curve

The majority of macroeconomists who have studied inflation dynamics in Europe argue that the New Keynesian Phillips Curve (NKPC) provides a good way to describe changes in the price level from the 1970 on. However the vast majority of these articles estimate the NKPC using the labor income share as the proxy for real marginal cost. This article argues that the labor share cannot serve as a proxy for real marginal cost because of its countercyclicality and the lack of labor adjustment costs. Once we account for labor adjustment costs, we are able to derive a new marginal cost proxy that is indeed procyclical; however, we find that the NKPC fails to produce coefficients consistent with its underlying structural parameters when a procyclical marginal cost proxy is used. This casts serious doubt whether the NKPC is empirically applicable to Europe or, for that matter, any other country.     

DO INTERNATIONAL MONETARY FUND PROGRAMS IMPACT ON THE SACRIFICE RATIO?

From time to time, the International Monetary Fund (IMF) makes resources available to member states for short‐term balance‐of‐payments support under an agreed arrangement know as a program. Most IMF programs include quantitative performance criteria for key macroeconomic variables, which borrowers must meet to obtain Fund resources. Standard open economy models predict that if policymakers are able to credibly commit to reducing inflation, rational economic agents will lower their expectations of inflation and, therefore, the trade‐off between inflation and output will fall. The present study tests whether IMF programs, by lending credibility to a country's adjustment program, influence the inflation–output trade‐off. The results from the study suggest that IMF programs do not significantly influence the inflation–output trade‐off. This finding is robust to changes in the estimation approach, the method used to obtain the output gap estimates and outliers.     

Globalization and Inflation: a Swiss Perspective

Is inflation caused by global developments instead of domestic monetary factors? This paper explores the role of globalization for inflation, especially in Switzerland, one of the smallest and most open economies where the globalization hypothesis should be most relevant. It provides tests of whether Swiss inflation is causally related to inflation elsewhere. It also examines Swiss inflation in a P* model and whether it is also influenced by inflation abroad or by import prices. It finds that Swiss inflation is made at home. Evidence is presented of a co-integrating relationship of Swiss and German inflation, likely due to common inflation objectives.     

Will the Sarb always Succeed in Fighting Inflation with Contractionary Policy?

The conventional view is that a monetary policy shock has both supply‐side and demand‐side effects, at least in the short run. Barth and Ramey show that the supply‐side effect of a monetary policy shock may be greater than the demand‐side effect. We argue that it is crucial for monetary authorities to understand whether an increase in expected future inflation is due to supply shocks or demand shocks before applying contractionary policy to forestall inflation. We estimate a standard New Keynesian dynamic stochastic general equilibrium model with the cost channel of monetary policy for the South African economy to show that whether the South African Reserve Bank should apply contractionary policy to fight inflation depends critically on the nature of the disturbance. If an increase in expected future inflation is mainly due to supply shocks, the South African Reserve Bank should not apply contractionary policy to fight inflation, as this would lead to a persistent increase in inflation and a greater loss in output. Our estimation results also show that with a moderate level of cost‐channel effect and nominal rigidities, a New Keynesian dynamic stochastic general equilibrium model with the cost channel of monetary policy is able to mimic the price puzzle produced by an estimated vector autoregressive model.     

DYNAMIC TIME INCONSISTENCY AND THE SOUTH AFRICAN RESERVE BANK

This paper derives the econometric restrictions imposed by the Barro and Gordon model of dynamic time inconsistency on a bivariate time-series model of consumer price index (CPI) inflation and real gross domestic product (GDP), and tests these restrictions based on quarterly data for South Africa covering the period of January 1960-April 1999, i.e. for the pre-inflation targeting period. The results show that the data are consistent with the short- and long-run implications of the theory of time-consistent monetary policy. Moreover, when the model is used to forecast one-step-ahead inflation over the period of January 2001-February 2008, i.e. the period covering the starting point of the inflation-targeting regime until date, we, on average, obtain lower rates of inflation. The result tends to suggest that the South African Reserve Bank perhaps needs to manage the inflation-targeting framework better than it has done so far.     

IS THERE AN ASYMMETRIC BEHAVIOUR IN AFRICAN INFLATION? A NON‐LINEAR APPROACH

In this paper we test the inflation persistence hypothesis as well as model the long‐run behaviour of inflation rates in a pool of African countries using a non‐linear framework. In order to do so, we rely on unit root tests applied to non‐linear models and fractional integration. The results show that the hypothesis of inflation persistence does not hold empirically for most of the countries. In addition, the estimated models (logistic smooth transition autoregressions) are stable in the sense that the variable tends to remain in the regime (low inflation or high inflation) once reached, and changes between regimes are only achieved after a shock. The results also indicate that the effects of the shocks on inflation tend to die out; exogenous factors, i.e. supply shocks and inertia may be causing this outcome, as they play a substantial role in the determination of the inflation rates for our selected African countries.     

Financial Factors in the Business Cycle of a Small Open Economy: The Case of Korea

Financial factors influencing the business cycle have received considerable attention in recent years in the aftermath of the global financial crisis in 2008. This paper examines the role of financial factors in the business cycle by considering Korea, a small open economy, that experienced a severe financial crisis in 1997 as well as the recent global financial crisis. We estimate small open economy Bayesian DSGE (dynamic stochastic general equilibrium) models with financial factors and analyze the role of these financial factors in the business cycle in the context of Korea. The results indicate that the model based on an endogenous financial accelerator and a modified monetary policy rule provides a better explanation to the data than that without the financial factors and justify the recent attention to financial factors influencing the business cycle.     

Targeting Rules for an Open Economy

This study extends the formal analysis of inflation targeting monetary policy using the standard New Keynesian framework to a small open economy by adding inflation and output persistence as well as a direct exchange rate channel to domestic inflation. We find that output variability is lower under CPI inflation targeting than under domestic inflation targeting. However, CPI inflation results in higher variability of the real exchange rate than domestic inflation targeting. Output and the nominal interest rate are less volatile under flexible inflation targeting than under almost-strict inflation targeting. We also find that almost-strict domestic inflation targeting cannot completely insulate domestic inflation from foreign shocks due to a direct exchange rate channel. The model is calibrated to Canadian data.     

Nominal debt and inflation stabilization

The “fiscal theory of currency crises” ( Daniel 2001 ; Corsetti and Ma?kowiak 2005, 2006 ) claims that with long‐term nominal debt, a government can delay the timing of an inevitable currency crisis that results from a fiscal shock. The present paper shows that, in contrast, long‐term nominal debt might have destabilizing effects when a government introduces an inflation stabilization policy. It is shown that a stabilization policy that is successful in the absence of long‐term nominal debt can cause a crisis when long‐term nominal debt exists. The model implies that a government with a large stock of long‐term nominal debt must overcome a high fiscal hurdle for a successful stabilization policy. This difficulty is avoidable if long‐term debt is indexed to inflation.     

What to Aim for? The Choice of an Inflation Objective when Openness Matters

Inflation targeting countries generally define the inflation objective in terms of the consumer price index. Studies in the academic literature, however, reach conflicting conclusions concerning which measure of inflation a central bank should target in a small open economy. This paper examines the properties of domestic, CPI, and real-exchange-rate-adjusted (REX) inflation targeting. In one class of open economy New Keynesian models there is an isomorphism between optimal policy in an open versus closed economy. In the type of model we consider, where the real exchange rate appears in the Phillips curve, this isomorphism breaks down; openness matters. REX inflation targeting restores the isomorphism but this may not be desirable. Instead, under domestic and CPI inflation targeting the exchange rate channel can be exploited to enhance the effects of monetary policy. Our results indicate that CPI inflation targeting delivers price stability across the three inflation objectives and will be desirable to a central bank with a high aversion to inflation instability. CPI inflation targeting also does a better job of stabilizing the real exchange rate and interest rate which is an advantage from the standpoint of financial stability. REX inflation targeting does well in achieving output stability and has an advantage if demand shocks are predominant. In general, the choice of the inflation objective affects the trade-offs between policy goals and thus policy choices and outcomes.     

The Impact of Political Instability on Inflation Volatility in Africa

This paper investigates whether political instability leads to volatile inflation using a panel of 49 African countries. The study uses novel measures of political instability, particularly the state failure index and state fragility index. In the field of political instability and inflation volatility, this is the first study to measure inflation volatility as the conditional variance of inflation estimated from GARCH (1, 1) model. Adopting the system‐generalized method of moments estimator for linear dynamic panel models for the sample period 1985‐2009, the study documents a positive statistically significant effect of political instability on inflation volatility.     

INFLATION TARGETING AND THE FISHER EFFECT IN SOUTH AFRICA: AN EMPIRICAL INVESTIGATION

The paper analyses the relationship between expected inflation and nominal interest rates during a period of inflation targeting in South Africa, i.e. from 2000 to 2005. Specifically, it investigates the Fisher hypothesis that nominal interest rates move one‐to‐one with expected inflation, leaving the real interest rate unaffected. The analysis distinguishes between a short‐run Fisher effect and a long‐run Fisher effect. Using cointegration and error correction models (for monthly data for the period April 2000 to July 2005), it was found that the short‐run Fisher hypothesis did not hold during the relevant period under the inflation targeting monetary policy framework in South Africa. This is attributed to a combination of the South African Reserve Bank's (SARB) control over short‐term interest rates and the effects of the monetary transmission mechanism. The long‐run Fisher hypothesis could not be confirmed in its strictest form: while changes in inflation expectations move in the same direction as the nominal long‐term interest rate. This suggests that monetary policy has an influence on the real long‐term interest rate, which has positive implications for general economic activity, thus confirming the credibility of the inflation targeting framework.     

The Transmission of Monetary Policy in South Africa Before and After the Global Financial Crisis

This paper examines whether the transmission mechanism of monetary policy in South Africa has changed after the global financial crisis (GFC). We use a Bayesian vector autoregressive (BVAR) model with Minnesota priors and 15 monthly variables, extending the system of Christiano, Eichenbaum, with Evans (1999). The benefit of the BVAR approach is that it can accommodate a large cross section of variables without running out of degrees of freedom. To identify the change in the transmission process, we divide the sample size into two subsamples, namely the pre‐GFC period (March 2001 to August 2008) and the post‐GFC period (September 2008 to February 2016). The results indicate that a change in the transmission of monetary policy occurred after the GFC. The magnitude of the effect of a monetary policy shock on output is considerably greater in the pre‐GFC period compared to the post‐GFC period. Moreover, the impact of a policy shock on inflation is not statistically significant in the post‐GFC period. The variance decomposition shows that the interest‐rate channel has possibly weakened in the post‐GFC period.