Smiles, Bid‐ask Spreads and Option Pricing

Given the evidence provided by Longstaff (1995), and Peña, Rubio and Serna (1999) a serious candidate to explain the pronounced pattern of volatility estimates across exercise prices might be related to liquidity costs. Using all calls and puts transacted between 16:00 and 16:45 on the Spanish IBEX‐35 index futures from January 1994 to October 1998 we extend previous papers to study the influence of liquidity costs, as proxied by the relative bid‐ask spread, on the pricing of options. Surprisingly, alternative parametric option pricing models incorporating the bid‐ask spread seem to perform poorly relative to Black‐Scholes.     

Further evidence on performance evaluation: Portfolio holdings,recommendations, and turnover costs

This paper analyzes the performance of mutual funds in Spain between January 1980 and June 1990. The robustness of results to alternative measurements and benchmarks are analyzed. The results indicate that, with monthly returns alone, it is not possible to distinguish between selectivity and timing. We are only able to measure the magnitude of total performance. To be more precise about the reasons behind performance, portfolio holdings are necessary. This work employs a new data set based on monthly portfolio holdings of a representative sample of funds. A comparison of results using monthly returns and monthly portfolio holdings is made. In particular, thanks to the availability of portfolio holdings, we are able to separate selectivity and timing. Finally, the impact of turnover costs is considered.     

Long‐range dependence in Spanish political opinion poll series

This paper investigates the time series properties of partisanship for five political parties in Spain. It is found that pure fractional processes with a degree of integration, d, between 0.6 and 0.8 fit the time‐series behaviour of aggregate opinion polls for mainstream parties quite well, whereas values of d in the range of 0.3 to 0.6 are obtained for opinion polls related to smaller regional parties. Those results are in agreement with theories of political allegiance based on aggregation of heterogeneous voters with different degrees of commitment and pragmatism. Further, those models are found to be useful in forecasting the results of the last general elections in Spain. As a further contribution, new econometric techniques for estimation and testing of ARFIMA model are used to provide the previous evidence. Copyright © 2003 John Wiley & Sons, Ltd.     

Emerging technologies: quantitative identification and measurement

Emerging technologies present both challenges and opportunities for national technology strategies. National governments may therefore want to monitor the technological horizon on a systematic basis. This article outlines the quantitative approaches available for such monitoring. Among the standard types of bibliometric data, proposals and publications are most likely to be useful for this purpose since they capture information earlier in the cycle of technology development. Patents, in contrast, trail behind. Analysis can proceed with keywords or citations, and algorithms are available to use the information structure inherent in these kinds of data to identify and measure emerging areas. There are limitations, however, in all the available approaches and the authors therefore recommend using them in conjunction with expert methods by focusing the qualitative assessment in particular areas.     

Testing, hold up and the dynamics of preferences

This paper presents an overlapping generations model with cultural transmission of preferences in an economy in which players face a hold up problem. One of the players, the firm, can use a testing technology which allows him to imperfectly monitor his partner's behaviour. This technology is completely useless with homogeneous preferences. We obtain that in the stable steady state of the economy there is a mixed distribution of preferences where both selfish and other-regarding preferences are present in the population. Moreover, with a good testing technology, the steady state is characterized by the first-best result in the investment decisions. JEL Classification: C78, D23, D63 The authors acknowledge financial support from the Spanish Ministry of Science and Technology project SEC2001-2763. This paper has also benefited from comments of participants in the XXVIII Spanish Symposium of Economic Analysis in Seville (Spain), in the International Workshop on Social and Behavioral Economics in Valencia (Spain), in the 2nd World Congress of the Game Theory Society in Marseille and in the VI Spanish Meeting on Game Theory and Practice in Elche (Spain).     

Specification via model selection in vector error correction models

This paper proposes a model selection approach for the specification of the cointegrating rank in the VECM representation of VAR models. Asymptotic properties of estimates are derived and their features compared with the traditional likelihood ratio based approach.     

Survival is for the fittest: Export survival patterns in Georgia

This paper analyzes the determinants of export flow survival in Georgia. The paper uses a unique Georgian firm-level dataset, in which firm characteristics and output dynamics are matched with their customs export transactions, for the period 2006–2012. We adopt a discrete survival model to explore the role of firm-level characteristics, diversification strategies and network effects on the survival rates of export flows. Low survival rates at the product level limit the ability of Georgian firms to consolidate new products in international markets. The analysis finds that it is production efficiency, rather than size, that boosts export survival chances, that firms’ diversification strategies matter for the prospects of survival, and that there is strong evidence of network effects in export survival. We also find that ratified foreign trade agreements contribute to increase the survival of export flows by reducing policy-induced trading costs and increasing information about destination markets.     

The Value of Territory: Towards a Marxist Geopolitics

The article argues for a Marxist geopolitics that moves beyond both critical geopolitics and the discredited classical geopolitics. It underlines the valorisation of territory by capital across three levels of abstraction: that of social infrastructure, class conflict and ground-rent proper. The recent Russian-Ukrainian gas wars are briefly analysed by way of illustrating the application of this distinctive approach to geopolitics.     

A new look at the UI effect on transitions from unemployment into wage employment in Spain: the limited duration of the UI benefits entitlement

This article is a new look at the study of the unemployment insurance effect on the transition probability from unemployment into wage employment in Spain. It is found that individuals increase their search effort and reduce their reservation wage as the unemployment insurance benefit entitlement exhaustion approaches, and their exit rate equals that of the unemployed who never got benefits from the exhaustion moment. Financial constraints are not important in Spain. Business cycle affects more to long-term unemployed. And, finally, it is found that the probability of being offered a vacancy decreases with time spent in unemployment, having allowed for unobservable heterogeneity.     

Estimation and model selection based inference in single and multiple threshold models

This paper evaluates the properties of a joint and sequential estimation procedure for estimating the parameters of single and multiple threshold models. We initially proceed under the assumption that the number of regimes is known á priori but subsequently relax this assumption via the introduction of a model selection based procedure that allows the estimation of both the unknown parameters and their number to be performed jointly. Theoretical properties of the resulting estimators are derived and their finite sample properties investigated.