The liberalisation of air transport that took place in the European Union at the beginning of the nineties has involved positive effects on the welfare traveller. However, there is an agreement in the academic literature that such effects depend on the existence of an effective competition at...

En este trabajo (a) se realiza una discusión sobre las dificultades teóricas y prácticas, en el análsisis de regresión, cuando se trata dedescribir el comportamiento de sistemas heterogéneos (b) se ofrecen un conjunto de nuevas técnicas de regresión adaptada para analizar las...

In this paper we document and account for the non-normality of returns exhibited by the indices in our samples. Consequently we re-examine the relationship between volatility and volume while distinguishing between returns within a trading day and returns across trading days. Our results...