Why is there controversy regarding China’s staple grain food market integration? Evidence and implication from price convergent club analysis

There remains ongoing controversy regarding the degree to which Chinese food markets are integrated. Some economists conclude that China’s grain economy is well integrated, while others argue that China’s gradual reforms have led to fragmented domestic markets while others conclude that previous studies have produced mixed results. To reconcile the debate, this article models and analyses the behaviour of China’s food grain retail markets by testing for the existence of the convergent price clustering clubs using appropriate econometric methods and price data over 1997–2010. The article finds evidence as to why the controversy remains by identifying a number of small divergent price clustering clubs where it is hard to conclude that China’s food grain markets are fully integrated. However, given that large convergent clustering clubs were also identified, it can be concluded that the degree to which Chinese grain food retail markets are integrated is ‘high’. This finding is important for those who plan to investigate the economic behaviour of grain production under the assumption of a pure, fully integrated, food market economy in China.     

A proposition of generalized stochastic Milevsky–Promislov mortality models

The aim of this article is to propose a new approach to the estimation of the mortality rates based on two extended Milevsky and Promislov models: the first one with colored excitations modeled by Gaussian linear filters and the second one with excitations modeled by a continuous non-Gaussian process. The exact analytical formulas for theoretical mortality rates based on Gaussian linear scalar filter models have been derived. The theoretical values obtained in both cases were compared with theoretical mortality rates based on a classical Lee–Carter model, and verified on the basis of empirical Polish mortality data. The obtained results confirm the usefulness of the switched model based on the continuous non-Gaussian process for modeling mortality rates.     

TECHNOLOGICAL EPOCHS AND BRITISH INDUSTRIAL PRODUCTION, 1700–1992

This paper presents results on the persistence of British industrial production using the Cochrane (1988) measure, based upon the spectral density at zero frequency, and an extended version of the Crafts-Harley (1992) data set. Utilising results on the timing of macroeconomic epochs, consideration is given to the effects of structural breaks on measures of persistence. In addition the variance composition of production is analysed via consideration of the cycle period. The results show high persistence during the Industrial Revolution and lower levels of persistence experienced during the twentieth century. The problems of ignoring structural breaks when claculating measures of persistence are highlighted and used to explain the results of some previous studies.     

The Dynamics of the S&P 500 Implied Volatility Surface

This empirical study is motivated by the literature on “smile-consistent” arbitrage pricing with stochastic volatility. We investigate the number and shape of shocks that move implied volatility smiles and surfaces by applying Principal Components Analysis. Two components are identified under a variety of criteria. Subsequently, we develop a “Procrustes” type rotation in order to interpret the retained components. The results have implications for both option pricing and hedging and for the economics of option pricing. This revised version was published online in June 2006 with corrections to the Cover Date.     

A test of the beta model on Eurodollar futures options

The paper reports empirical tests of the beta model for pricing fixed-income options. The beta model resembles the Black–Scholes model with the lognormal probability distribution replaced by a beta probability distribution. The test is based on 32 817 daily prices of Eurodollar futures options and concludes that the beta model is more accurate than alternative option pricing models.     

A note on the efficiency of the binomial option pricing model

We discuss the efficiency of the binomial option pricing model for single and multivariate American style options. We demonstrate how the efficiency of lattice techniques such as the binomial model can be analysed in terms of their computational cost. For the case of a single underlying asset the most efficient implementation is the extrapolated jump-back method: that is, to value a series of options with nested discrete sets of early exercise opportunities by jumping across the lattice between the early exercise times and then extrapolating from these values to the limit of a continuous exercise opportunity set. For the multivariate case, the most efficient method depends on the computational cost of the early exercise test. However, for typical problems, the most efficient method is the standard step-back method: that is, performing the early exercise test at each time step.     

Are China's energy markets cointegrated?

The paper investigates energy price co-movement over the period 01/1999–12/2005 for China as a whole, and over sub-periods and for seven regions, using panel unit root and panel cointegration tests developed by Pedroni (1999, 2004). The results suggest that not all energy sources are spatially homogenous in prices and the processes of energy price cointegration are different over sub-periods; over groups of fuels; and over regions. Coal and electricity prices have co-moved since 2003 while gasoline and diesel prices have co-moved since 1997. The results show that there are clearly variations in the emergence of energy price co-movement over regions, implying that regional fuel markets have emerged in China. Important lessons that can be learnt from the results are that an energy market has, to some extent, already emerged in China and, as a result, energy prices are substantially less distorted than before. If correct, these findings have significant global implications both in terms of future emission reductions, emission trading and trade negotiations where China should be treated as a ‘market driven economy’.     

Workers' compensation: Determining a feasible payment structure in a regulatory environment

Moral hazard complicates the design of an optimal benefit structure in a regulated social insurance program such as workers' compensation. We discuss the type of empirical information necessary to set optimal benefit levels in the presence of moral hazard. Since we present trends in indemnity and medical expenditures that indicate the presence of claims rate moral hazard, we develop and estimate a model of this type of moral hazard. We find evidence of moral hazard effects that are roughly consistent with those found elsewhere in the literature. We also present the first direct estimates of the impact of benefits on the output of the firm. We find that an increase in real benefits significantly decreases the output of the firm. This is consistent with notion that higher benefits induce more jobless spells and increase production costs using skilled labor. We close by illustrating how these estimates can be used to provide information on the feasible benefit schedule, given the presence of moral hazard.     

Estimating the joint tail risk under the filtered historical simulation: An application to the CCP’s default and waterfall fund

The estimation of joint tail risk is necessary to evaluate the size of portfolio margins and default funds of central counterparties. The ability of filtered historical simulation to satisfy new regulatory requirements in this area is examined at the very high confidence levels, necessary to ensure market integrity over time.