Search results for "Economia"
showing 10 items of 2567 documents
Holidays, weekends and range-based volatility
2020
Abstract This study analyses the effect of non-trading periods on the forecasting ability of S&P500 index range-based volatility models. We find that volatility significantly diminishes on the first trading day after holidays and weekends, but not after long weekends. Our findings indicate that models that include autoregressive terms that interact with dummies that allow us to capture changes in volatility levels after interrupting periods provide greater explanatory power than simple autoregressive models. Therefore, the shorter the length of the non-trading periods between two trading days, the higher the overestimation of the volatility if this effect is not considered in volatility for…
Impacto del riesgo de interés sobre las acciones del sector bancario español
2009
RESUMENEste trabajo examina la exposicion del sector bancario espanol al riesgo de interes en el ambito de la metodologia GARCH, prestando atencion no solo al impacto de los cambios en el nivel de los tipos de interes sino tambien al efecto de su volatilidad sobre la distribucion de los rendimientos de las acciones bancarias. Los resultados obtenidos muestran que tanto las variaciones como la volatilidad de los tipos de interes tienen un impacto negativo y significativo sobre el rendimiento de las acciones de las entidades financieras, existiendo una relacion directa entre el tamano de las entidades y su grado de sensibilidad ante los movimientos y volatilidad de los tipos de interes.
Pricing the Option to Surrender in Incomplete Markets
2010
New international accounting standards require insurers to reflect the value of embedded options and guarantees in their products. Pricing techniques based on the Black and Scholes paradigm are often used; however, the hypotheses underneath this model are rarely met. We propose a framework that encompasses the most known sources of incompleteness. We show that the surrender option, joined with a wide range of claims embedded in insurance contracts, can be priced through our tool, and deliver hedging portfolios to mitigate the risk arising from their positions. We provide extensive empirical analysis to highlight the effect of incompleteness on the fair value of the option.
Aspetti economici e commerciali dell'arancia di Ribera
2010
The Sicily is the first region for orange cultivation in Italy. This sector, throughout the ages, has been characterized by a decrease of the invested areas and by a reduction of the fresh product’s demand; in the meantime, the competitiveness of the new producer countries is increased for a better commercial organization and for lower production costs. The aim of the paper is to improve the knowledge of orange cultivation in Ribera area, in the province of Agrigento (Sicily). It is carried out a microeconomic analysis on a sample of 20 farms to determine profitability of orange cultivation by means of various economic indicators (production costs, profits, net incomes). The business survey…
Adapting to High Temperatures: Effect of Farm Practices and Their Adoption Duration on Total Value of Crop Production in Uganda
2021
In this article, we use spatially granular climate data merged with four waves of household survey data in Uganda to examine empirically the relationships among high temperatures, total value of crop production, and the adoption and adoption duration of two sustainable agricultural practices (organic fertilizer adoption and maize–legume intercropping). We do this using a fixed-effect model with instrumental variables to address potential endogeneity issues. Our findings indicate that the adoption of these practices has a positive effect on the total value of crop production, and such effect increases monotonically as temperatures increase from long-term averages. Moreover, the number of yea…
Knowing is half the battle: Seasonal forecasts, adaptive cropping systems, and the mediating role of private markets in Zambia
2019
Abstract This paper examines how smallholders living in regions where a drought is forecasted adapt their farm practices in response to receiving seasonal forecast information. The article draws on a unique longitudinal dataset in Zambia, which collected information from farm households before and after a significant drought caused by the 2015/2016 El-Nino Southern Oscillation. It finds that farmers residing in areas forecasted to be drought-affected and receiving seasonal forecast information are significantly more likely to integrate drought tolerant crops into their cropping systems compared to similar households not receiving this information. Moreover, the probability that a farmer imp…
The rationality of rainy day savers: objective and subjective determinants of individual savings in Britain
2022
Using the largest and richest data on savings in Great Britain, six waves of the Wealth and Assets Survey from the Office for National Statistics, we compare standard life cycle models of saving with models using more 'subjective' measures, and the added dimension of longitudinal data. Whilst the life cycle model provides a benchmark, regular criticisms remain, particularly people's propensity to continue saving at older ages. Data on attitudes attenuate that issue, and panel data largely eliminate it. Our results confirm empirically, for Great Britain, the importance of some of the objective determinants of savings included in life cycle theory. When we look at more subjective ones, we sho…
Do robots complement or substitute for older workers?
2021
Abstract The impact of robotization on labor market outcomes has been recently empirically investigated along several directions, including employment, wages and labor productivity. This work contributes to this literature by looking for heterogeneous effects of robots on the workforce, analyzed by age cohorts. Relying on a panel of data from IFR (2019) and EU KLEMS (2009) over the years 1994–2005, we find consistent evidence of higher complementarity between robots and older workers (hours worked by employees aged 50 and over), and a greater substitutability among robots and younger cohorts of the labor market. These findings are robust to age group disaggregation and specific capital pric…
Damned If You Do and Damned If You Don’t: Two Masters
2018
Available online: 05 June 2018 We study common agency problems in which two principals (groups) make costly commitments to incentives that are conditioned on imperfect signals of the agent's action. Our framework allows for incentives to be either rewards or punishments. For our basic model we obtain a unique equilibrium, which typically involves randomization by both principals. Greater similarity between principals leads to more aggressive competition. The principals weakly prefer punishment to rewards, sometimes strictly. With rewards an agent voluntarily joins both groups with punishment it depends on whether severe punishments are feasible and cheap for the principals. We study whether…
School grading and institutional contexts
2011
We study how the relationship between students' cognitive ability and their school grades depends on institutional contexts. In a simple abstract model, we show that unless competence standards are set at above-school level or the variation of competence across schools is low, students' competence valuation will be heterogeneous, with weaker schools inflating grades or flattening their dependence on competence, therefore reducing the information content and comparability of school grades. Using data from the OECD-PISA 2003 Survey, the model is applied to a sample of four countries, namely Australia, Germany, Italy, and the Netherlands. We find that in Australia, schools' heterogeneity does …