Bio-economic modelling of soil erosion externalities and policy options: a Tunisian case study

Soil erosion is one of the most important of today’s environmental externalities and a major threat to sustainability of agricultural system. It constitutes the most widespread forms of land degradation throughout the world. The aim of this paper is to estimate the amount of soil erosion generated by the current cropping systems in Tunisia and to assess the economic and ecological impacts of policy instruments designed to handle this problem. The analysed policy options are based on soil conservation practices and direct incentive farming anti-erosive measures. The selected measures are the reduction of tillage, the avoidance of bare fallow and the use of legume-based crop rotation. A bio-economic modelling framework coupling the biophysical model EPIC to a non-linear dynamic programming farm model was used for this impact analysis. It was performed in a set of representative farms belonging to a region in North-Eastern Tunisia (Zaghouan) strongly affected by this phenomenon. The main finding of this research is the non-convexity of the crop yield—soil erosion space. That is, the use of more intensive techniques to increase productivity (i.e. crop yield) may be accompanied by rough changes in soil erosion (damage) curves, manifested either by non-monotony or non-convexity. In term of policy options and because of giving up convexity assumptions, incentive anti-erosive measures appear more efficient than conventional environmental policies such as Pigouvian taxes or quota systems. The implementation of soil conservation practices would leads to a net decrease in soil erosion and an increase in farm income. However, with the current interest rate of 7% the possible rise in income is not enough to stimulate farmers to invest on these practices. A maximum rate of 4% would be necessary to make this policy option more effective.     

The volatility of prices in the English and Welsh electricity pool

The volatility of spot prices has been a notable feature of the English and Welsh Electricity Pool since its formation in 1990. This study investigates the possibility that the volatility of spot prices is strongly affected by the functioning of the contract market for electricity. This paper suggest that generators with market power may have an incentive to create volatility in the spot market in order to benefit from higher risk premia in the contract market. A simple theoretical model is used to illustrate this argument. Nonparametric techniques are used to test for changes in volatility after the expiry of the coal contracts in 1993 and during the price cap of 1994–1996. Strongly significant increases in volatility are found in the latter period.     

Oil prices and stock returns: nonlinear links across sectors

We present evidence of an asymmetric relationship between oil prices and stock returns. The two regime multivariate Markov switching vector autoregressive (MSVAR) model allow us to capture the state shifts in the relationship between regional stock markets and sectors. Results suggest that oil price risk is significantly priced in the sample used. The impact is asymmetric with respect to market phases, and regimes have been associated with world economic, social and political events. Our study also suggests asymmetric responses of sector stock returns to oil price changes and different transmission impacts depending on the sector analyzed. There is a high causality from oil to sectors like Industrials and Oil & Gas. Companies inside the Utilities sector were more able to hedge against oil price increases between 2007 and 2012. Historical crisis events between 1992–1998 and 2003–2007 do not seem to have affected the relationship between oil and sector stock returns, given the higher probability of remaining smoother. For all sectors there seems to be a turn back to stability from 2012 onwards. Finally, investors gain more through portfolio diversification benefits built across, rather than within sectors.     

Unanticipated money,output, employment and prices in a develoing economy: the korean case

This paper examines the effect of unanticipated money on output, unemployment and prices in Korea. The empirical results tend to reject the policy ineffectiveness proposition (PIP) in most cases. They show that both anticipated and unantipated money affect output and prices, in contract with the PIP. Mixed results are obtained for the effect of monetary variables on unemployment. The statistical results show that the regular OLS two step estimates yield t values which are upward biases by 0–27% as compared with the consistent estimates of the variance-covariance matrix that are obtained in this study. [E 51]     

Oil prices and economic downturns: the case of Spain

We address the macroeconomic effects of an oil price shock in Spain. We apply a vector autoregression model (VAR) analysis to quarterly data for the Spanish economy since 1986, to elucidate the effects of variations in the oil price on the economy, considering the three main causes of disruptions in the oil markets: oil supply shocks, oil demand shocks and oil-specific (precautionary) demand shocks. We conclude that the effects in Spain strongly depend on the type of shock: the consumer price index (CPI) has mainly been influenced by oil demand shocks; output has only reacted to oil supply shocks; and monetary policy has mainly reacted after precautionary shocks. Second-round effects caused by the behaviour of nominal wages have not been found. Additionally, we discuss two facts: the ability of firms to increase markups in a context of rising demand and the procyclical role of monetary policy when faced with oil demand shocks.     

Economic theory and econometric dynamics in modelling wages and prices in the United Kingdom

We show that a “competing claims” model of imperfect competition can explain the movements of wages and prices in the United Kingdom, using quarterly data covering 1976–93. We argue that careful attention both to economic theory and to the interaction between dynamics and identification is crucial in the building of the model and to dynamic econometric models in general. We use a small numerical example with simulated cointegrated data to illustrate the potential pitfalls. First version received: January 1998/final version received: November 1998     

Exchange rates and commodity prices: the case of Australian metal exports

Exporters of homogeneous commodities are usually regarded as ‘price takers’ who operate in perfectly competitive international markets, so that the pass-through of exchange rate changes to foreign-currency prices must be zero. However, many Australian commodities are subject to influences that may produce more complex pricing strategies, for example, markets in which Australia is a dominant exporter, or where there are few buyers and sellers due to the presence of large multi-national corporations. This study uses multivariate cointegration techniques to examine the pricing of Australian metal exports, with particular emphasis on the degree and timing of the pass-through of exchange rate and other changes.     

The out-of-sample forecasting performance of nonlinear models of regional housing prices in the US

This article provides out-of-sample forecasts of linear and nonlinear models of US and four Census subregions’ housing prices. The forecasts include the traditional point forecasts, but also include interval and density forecasts, of the housing price distributions. The nonlinear smooth-transition autoregressive model outperforms the linear autoregressive model in point forecasts at longer horizons, but the linear autoregressive and nonlinear smooth-transition autoregressive models perform equally at short horizons. In addition, we generally do not find major differences in performance for the interval and density forecasts between the linear and nonlinear models. Finally, in a dynamic 25-step ex-ante and interval forecasting design, we, once again, do not find major differences between the linear and nonlinear models. In sum, we conclude that when forecasting regional housing prices in the United States, generally the additional costs associated with nonlinear forecasts outweigh the benefits for forecasts only a few months into the future.     

Asset prices in a Huggett economy

This paper explores asset pricing in economies where there is no direct insurance against idiosyncratic risks but other assets can be used for self-insurance, subject to exogenously-imposed borrowing limits. We analyze an endowment economy, based on Huggett (1993) [11], both with and without aggregate risk. Our main innovation is that we obtain full analytical tractability by studying the case with “maximally tight” borrowing constraints. We illustrate by looking at riskless bonds, equity, and the term structure of interest rates, and we show that the model can reproduce many features of observed asset prices when idiosyncratic risks are quantitatively reasonable.     

Stock prices and money velocity: a multi-country analysis

What kind of information do stock prices offer for predicting velocity? This paper develops previous work by Milton Friedman for the US economy and shows that in a panel of 25 countries a wealth effect derived from the stock market has negatively influenced the ratio of nominal income to a broad definition of money. Taking quarterly data for the period 1961–1998, the relationship holds in Japan, the UK and Switzerland; in Italy a substitution effect (away from money) has also been operating. Overall, these empirical findings indicate the presence of systematic influences of stock price fluctuations on money velocity and suggest that the repercussions of asset inflation and deflation on the behavior of monetary aggregates should be monitored. First version received: July 1998/Final version received: November 2000     

Information in stock prices: the case of the 2016 U.S. presidential election

On the day before the 2016 U.S. presidential election, the odds of Hillary Clinton winning the presidency, according to political prediction markets, were above 90%. Surprisingly, Donald Trump won the Electoral College handily. In this study, we examine how movements in specific stock prices foreshadowed the eventual outcome. Specifically, we conduct a series of standard event-study tests focused on pharmaceutical companies, which became a focal point during the presidential campaign. Results show that while stocks of pharmaceutical companies significantly underperformed the market prior to the election, prices substantially increased beginning three days before the election outcome. This increase is both statistically significant and economically meaningful and robust to various event-study methodologies. These results suggest that some sectors of the stock market seemed to anticipate the election outcome.     

The exchange rate pass-through into import prices: the case of Japanese meat imports

Japan is a traditional net importer of food products in general and meat products in particular. Japanese meat imports come from a few countries thus making Japan potentially very sensitive to the swings in one or a few bilateral exchange rates. One of the key contributions of this article is the use of commodity (meats in this case) imports weighted exchange rates in the analysis. The standard practice in previous international agricultural trade studies related to either exchange rate pass-through or pricing to market was to use the aggregate trade weighted exchange rates usually provided by the Central Bank authorities or sources. Beef and poultry import prices indicate partial exchange rate pass-through while import prices of pork indicate zero exchange rate pass-through, primarily due to gate price policy system applied to pork imports. In terms of competitiveness, these results suggest relatively more competitive markets among poultry importing firms, somewhat competitive markets among beef importing firms, while competitiveness of pork importing firms could not be assessed due to existing import policies.     

Introducing a new currency: Government policy and prices

The aim of this article is to study the introduction of a new fiat currency within a dual-currency divisible goods search model. The government (using price control or legal tender laws) can affect the equilibrium price levels of two domestic currencies, with the goal of driving the old currency out of circulation and replacing it with a new one. It is shown that some equilibrium solutions that exist in a laissez-faire environment disappear with government monitoring. Additionally, when the old currency is made illegal, its equilibrium value is affected differently by public measures such as conversion, tax and redistribution policies. Finally, if the enforcement power of legal tender laws is strong enough, the old currency cannot be more valuable than the new one, and the probability that it changes hands in trade, when introducing lotteries, cannot be smaller than one.     

Financial development and economic growth nexus: a time-series evidence from India

This study examines the relationship between financial development and economic growth in India for the period 1951–52 to 1995–96. The long-run equilibrium and short-run dynamic models are estimated using financial interrelations ratio and new issue ratio as the measures of financial development, a la Goldsmith (1969 Goldsmith, RW. 1969. Financial Structure and Development, New Haven: Yale University Press.  [Google Scholar]). The Johansen (1991 Johansen, S. 1991. Estimation and hypothesis testing of cointegration vectors in Gaussian vector autoregressive models’. Econometrica, 59: 1551–80. [Crossref], [Web of Science ®] , [Google Scholar]) estimator rejects the null of zero cointegrating vector and shows the presence of long-run equilibrium relationship between financial development and economic growth. The error correction model, impulse response and variance decomposition analyses (Sims, 1980 Sims, CA. 1980. Macroeconomics and reality. Econometrica, 48: 1–48. [Crossref], [Web of Science ®] , [Google Scholar]), and the Toda and Yamamoto (1995 Toda, HY and Yamamoto, T. 1995. Statistical inference in vector autoregressions with possibly integrated processes. Journal of Econometrics, 66: 225–50. [Crossref], [Web of Science ®] , [Google Scholar]) estimator show the presence of bidirectional Granger-causality between financial development and economic growth. The presence of bidirectional Granger-causality suggested by these estimators points towards the possible problem of endogeneity and simultaneity bias in the growth models that examine the contemporaneous effect of financial development on economic growth. The economic reforms that started since July 1991 emphasized on the liberalization and development of financial sector to supplement the efforts aimed at achieving high economic growth in India.     

The effect of exchange rates on prices,wages, and profits: A case study of the United Kingdom in the 1990s

Abstract

During the 1990s the United Kingdom experienced large and sudden exchange rate movements that had no apparent impact on overall consumer prices. This paper shows that the stability of UK consumer prices was made possible in part by offsetting movements in the price-cost margins of foreign exporters and in part by offsetting price-cost margins in the UK distribution sector. At the same time, UK manufacturers experienced margin swings in the opposite direction, largely due to their role as exporters. Thus, sterling depreciation boosted the profits of UK manufacturers and squeezed the profits of UK distributors, while sterling appreciation had the opposite effects.