Income and Price Elasticities of Demand in South Africa: An Application of the Linear Expenditure System

This paper investigates the expenditure patterns of South African households using detailed cross‐sectional expenditure and price data that varies across region and time. Linear expenditure system parameter estimates are used to calculate income and price elasticities for a number of product categories at different points of the income distribution. We find substantial variation in the price and income elasticities of demand for items across the income distribution, with the bottom quartile being extremely sensitive to increases in the price of food and clothing items, and the top quartile being as sensitive as households in developed countries.     

Short‐run marginal medical costs from booze and butts: Evidence from the states

This article uses a panel data set of U.S. states over the 1980 to 2007 period to estimate the demands for medical care, cigarettes, and beer. The estimation process generates own‐price, income, and cross‐price elasticities for all three goods. Implied per capita beer and cigarette consumption elasticities of per capita health care expenditures, suggested by our baseline estimates, are 0.83 and 0.14, respectively. These results are robust to a number of specification tests. Simulations suggest that yearly marginal medical costs amount to approximately $12 per bottle and 27 cents per cigarette in the short run (in 2012 dollars). These results are likely to be driven by the much larger corresponding increases in the consumption of binge drinkers and heavy smokers.

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THE DEMAND FOR FOOD IN SOUTH AFRICA1

Food consumption is an important issue in South Africa, given its relation to poverty and deprivation. With the pressing need to increase food security, understanding the determinants of the demand for food and having some estimates of the likely impact of price and income changes has become a vital task. There is, however, surprisingly little economic research on this topic and almost none in recent times. This paper provides a comprehensive empirical analysis of the demand for food in South Africa for the years 1970‐2002. It moves beyond the usual static modelling approach in using a general dynamic log‐linear demand equation and a dynamic version of the almost ideal demand system, to provide estimates of the short‐ and long‐run price and expenditure demand elasticities.     

An aggregate import demand function for greece

This study estimates the aggregate import demand function for Greece using annual data for the period 1951–92. There are two methodological novelties in this paper. The authors find that the variables used in the aggregate import demand function are not stationary but are cointegrated. Thus, a long-run equilibrium relationship exists among these variables during the period under study. The price elasticity is found to be close to unity in the long run. The cross-price elasticity is also found to be close to unity. Import demand is found to be highly income elastic in the long run. This implies that with economic growth, ceteris paribus, the trade deficit for Greece is likely to get worse.     

Remittances' Influence on Housing Construction Demand in Sub‐Saharan Africa: The Case of Kenya

Abstract: Although it is well documented that immigrants maintain economic and social ties with their communities of origin through remittances, the role of remittances in asset acquisition for most African countries is yet to be documented. This study provides empirical estimates for the impact of remittances from abroad on housing construction demand in Kenya using time series data for the period 1970–2008. An autoregressive distributed lag (ARDL) modelling process is employed to capture the effect of remittances and other variables on housing construction demand. The computed short‐ and long‐run elasticities indicate that inbound remittances are one of the determinants of housing construction demand in Kenya. Other significant determinants include income, interest rates and urbanization growth.     

THE IMPLICATIONS OF SOUTH AFRICAN ECONOMIC GROWTH FOR THE REST OF AFRICA

This paper measures the extent to which South African economic growth is an engine of growth in sub‐Saharan Africa. Results based on panel data estimation for 47 African countries over four decades suggest that South African growth has a substantial positive impact on growth in the rest of Africa, even after controlling for other growth determinants. The estimates are robust to the effects of global and regional shocks, changes in model specification, and sample period.     

Estimating the future health care cost of population aging in South Africa

ABSTRACT

This paper analyses the relationship between health care expenditure and population aging in South Africa using yearly data from 1983 to 2015. Empirical evidence from an Autoregressive Distributed Lag approach to cointegration indicates that old dependency and life expectancy are major drivers of public health expenditure in South Africa besides the income. Particularly, when structural breaks are controlled for, income exhibits a long-term elasticity with respect to health spending greater than unity; suggesting that South African public health care has become a luxury good over time. Interestingly, South African public health spending is found to be responsive to demographic development only in the long run. This is consistent with the micro evidence that health expenditure increases with individual age with significant impacts in the long term. Finally, using economic and demographic projections statistics, we find that public health expenditure could roughly double in the next fifteen years ceteris paribus.     

Illegal Cartel Overcharges in Markets with a Legal Cartel History: Bitumen Prices in South Africa

In recent years, South African competition authorities have initiated a number of price‐fixing cases in markets where cooperation among competitors was legal and often encouraged. These markets present economists with special difficulties when estimating cartel overcharges. Conventional approaches often rely on temporal approaches, where pricing during the cartel period is compared with prices in a competitive period. In markets with a legal cartel history, a competitive price cannot be identified in the period preceding illegal collusion. Structural change also reduces data, and hence the robustness of temporal models. Spatial approaches, where prices are compared with those in other countries, offer a better alternative. The paper studies the performance of temporal and spatial approaches in estimating overcharge in the context of a bitumen price‐fixing case. The results suggest that, while the bitumen cartel may have responded to cost and demand shocks in a similar way to how players in more competitive markets respond, it was still cushioned by a large monopoly premium: the long‐run level of South African bitumen prices are higher than in comparable competitive markets. The findings have implications for the study of transition dynamics from legal to illegal cartel regimes and for the detection of cartels.     

The Demand for Money in Brunei

Based on data for the 1974–95 period this paper estimates demand for narrow money and broad money in Brunei using the error-correction specification. Short-run and long-run elasticities are estimated with respect to real income, interest rate, expected price level and liquidity. Narrow money is quite responsive to changes in real income and interest rate in both the short and long terms. Broad money is income inelastic regardless of the time horizon, however, it is interest inelastic in the short run but interest elastic in the long run. Price elasticity of money demand is negligible in the short run but quite significant in the long run. Changes in the proportion of commercial bank assets placed in foreign money markets do not seem to affect demand for narrow money but their effect on the demand for broad money is both direct and significant.     

THE CYCLICALITY OF MONETARY AND FISCAL POLICY IN SOUTH AFRICA SINCE 1994

This paper uses a structural vector‐autoregression approach to discuss the cyclicality of fiscal and monetary policy in South Africa since 1994. There is substantial South African literature on this topic, but much disagreement remains. Though not undisputed, there is growing consensus that monetary policy has contributed to the remarkable stabilisation of the South African economy over this period. The evaluation of the role of fiscal policy in stabilisation has been less favourable and there is little evidence that a countercyclical fiscal stance was a priority over this period. This paper considers these issues in an empirical framework that addresses some of the shortcomings in the literature. Specifically, it constructs a structural model in contrast with the reduced form models typically used in the South African literature, incorporates the dynamic interaction between monetary and fiscal shocks on the demand side and supply shocks on the other, and avoids controversy over “neutral” base years and the size of fiscal elasticities. The model confirms the consensus on monetary policy, finding it to have been largely countercyclical since 1994. On fiscal policy, this paper finds evidence of pro‐cyclicality, especially in the more recent period, though the policy simulations suggest that the pro‐cyclicality of fiscal policy has had little destabilising impact on real output.     

Dynamics of U.S. State Cigarette Consumption: Evidence from Panel Error Correction Modeling

This study uses state-level data for nearly four decades to study the dynamic demand for cigarettes, focusing especially on the long-run equilibrium relationship between cigarette consumption and its determinants as well as the short-run and long-run causal dynamics. We find the presence of cointegration with the long-run equilibrium, indicating the price elasticity of cigarette demand to be negative and inelastic, the income elasticity is positive and the border smuggling effects are significant, with substantial variations across individual states. Of the various smoking control policies considered, questions remain as to the effectiveness of aggregate anti-smoking initiatives that treat all states alike. Furthermore, the causal dynamics reveal bi-directional causality between cigarette consumption and its determinants. Some policy implications are discussed.     

Are Chinese smokers sensitive to price?

We estimate cigarette price and income elasticities for urban China, 1995. We find an overall cigarette price elasticity of 0.5, which lies between previous estimates. This implies that a 10% increase in price would result in a decline in cigarette consumption of 4.5 billion packs and would raise Y34 billion in additional tax revenue.     

MEASURING THE WELFARE COST OF INFLATION IN SOUTH AFRICA

In this paper, we estimate the long‐run equilibrium relationship between money balance as a ratio of income and the Treasury bill rate for the period of 1965:02 to 2007:01, and in turn use the relationship to obtain welfare cost estimates of inflation. Using the Johansen technique, we estimate a log‐log specification and a semi‐log model of the above relationship. Based on the fits of the specifications, we decided to rely more on the welfare cost measure obtained under the log‐log money demand model. Our estimates suggest that the welfare cost of inflation for South Africa ranges between 0.34% and 0.67% of GDP, for a band of 3‐6% of inflation. Thus, it seems that the South African Reserve Bank's current inflation target band of 3‐6% is not too poorly designed in terms of welfare.     

SYNCHRONISATION BETWEEN SOUTH AFRICA AND THE U.S.: A STRUCTURAL DYNAMIC FACTOR ANALYSIS

This paper studies the synchronisation of the South African and the US cycles and transmission channels through which supply and demand shocks from the US affect economic activity in South Africa in a structural dynamic factor model framework. We find, using the full-sample period, US supply shocks are transmitted to South Africa through business confidence and imports of goods and services; while US demand shocks are transmitted via interest rates, stock prices, exports of goods and services, and real effective exchange rates. Second, there is a decrease in integration over time translated by a drop in synchronisation of cycles. The impact of an increase in comovement of GDP is outweighed by the structural reforms initiated by the government after the end of apartheid. Finally, the idiosyncratic component still plays an important role in the South African economy.     

LONG-RUN M3 DEMAND IN SOUTH AFRICA: A COINTEGRATED VAR MODEL

This paper presents a system cointegration analysis of a long‐run demand for money (measured in terms of M3) in South Africa. In particular, the paper estimates a cointegrated vector autoregression model, consisting of real money, income and the opportunity cost of holding money. Using a variety of theory consistent identification schemes, the money demand function is identified along with other two cointegrating relations, namely, an IS‐type relationship and a relationship relating inflation to the spread between long‐ and short‐term interest rates. The model shows that of the variables used, only income and real money are error‐correcting to the money demand relation. The money demand relation is found to be relatively stable over the sample period, when short‐run fluctuations are corrected for. The model further shows that the long‐run link between money and inflation is rather weak.     

BAYESIAN METHODS OF FORECASTING INVENTORY INVESTMENT

This paper develops a Bayesian Vector Error Correction Model (BVECM) for forecasting inventory investment. The model is estimated using South African quarterly data on actual sales, production, unfilled orders, price level and interest rate, for the period 1978 to 2000. The out-of-sample-forecast accuracy obtained from the BVECM over the forecasting horizon of 2001:1 to 2003:4, is compared with those generated from the classical variant of the Vector Autoregresssive (VAR) model and the VECM, the Bayesian VAR, and the recently developed ECM by Smith et al. , for the South African economy. The BVECM with the most-tight prior outperforms all the other models, except for a relatively tight BVAR which also correctly predicts the direction of change of inventory investment over the period of 2004:1 to 2006:3.     

Response by Adults to Increases in Cigarette Prices by Sociodemographic Characteristics

Cigarette excise taxes are widely viewed by health economists as an effective tool to reduce cigarette consumption. However, those opposed to increasing cigarette excise taxes often state that the taxes unfairly target certain segments of the population, notably the poor and minorities. Some of this opposition may have been fueled by a lack of understanding of how the tax will affect the health and welfare of various demographic groups of interest. This article provides guidance to policy makers by estimating price elasticities among adults by gender, income, age, and race or ethnicity. Women, adults with income at or below the median income, young adults, African-Americans, and Hispanics are most responsive to cigarette price increases. For example, adults with income at or below the median are more than four times as price-responsive as those with income above the median.     

PATTERNS OF CO‐MOVEMENT BETWEEN SOUTH AFRICA AND GERMANY: EVIDENCE FROM THE PERIOD 1985 TO 2006

This paper examines the co‐movement between Germany and South Africa by applying a dynamic factor model. Because these two countries have a long history of predominant trade ties, they deemed to be suitable proxies to analyse the channels of transmission of positive supply and demand shocks in a developed economy and the effects of these on an emerging market economy. In contrast to general expectations, the paper concludes that a German supply shock has more of a demand‐shock effect on the South African economy, while a German demand shock is transmitted through price in South Africa. This implies that the policy response in South Africa should not necessarily be the same as in Germany.     

Housing demand in Shanghai: A discrete choice approach

In this study we apply a random utility modeling framework to analyze housing demand in the city of Shanghai. A Multinomial Logit Model taking account of latent choice sets is employed to investigate the impact of household characteristics, such as income, size and age composition, on the choice of dwelling, specified by location, size and unit price. In addition to the price and income effects on housing demand, the model identifies a quality indicator for dwelling attributes, which can be interpreted as the mean attractiveness in a money metric measure.The data used in this study are cross-sectional survey data. The estimated model is used to calculate demand elasticities and demand probabilities, for selected groups of households and types of dwellings. Among the results can be noted that the price–income ratios, the age composition and size of household are all important determinants of the demand. The impact of income distribution on housing demand is also studied.     

Deconstructing ‘the foreign’: The limits of citizenship for explaining price competition in the Spaza sector in South Africa

An important component of the informal economy in South Africa, the Spaza sector is portrayed as dominated by foreign nationals who outcompete South African shopkeepers on price. Indeed, this business competition from foreign nationals is a key reason given to explain xenophobia in South Africa. This article sets out to interrogate this widely held assumption. Drawing on evidence from over 1000 Spaza shops from South Africa’s three main cities, the article makes the case that business competitiveness does not correspond with ‘foreign’ or South African identities in a simple way. Firstly, while citizenship or nationality is a factor, it is not captured by the labels of ‘foreign’ versus South African, as there are significant differences by nationality within the ‘foreign’. Secondly, not all foreign nationalities out-compete South Africans on price. Thirdly, place matters too, not only because we find different nationalities in different cities, but also because there are different patterns of price competition by nationality in each place. Lastly, there are product-specific dynamics that impact on price more profoundly than nationality. For example, regardless of nationality, milk is cheaper in Cape Town and bread is cheaper in Johannesburg.