The choice of generalized linear mixed models is difficult, because it involves the selection of both fixed and random effects. Classical criteria like Akaike’s information criterion (AIC) are often not suitable for the latter task, and others which are useful in linear mixed models are...

The current international tax system diverges greatly from a theoretically ‘‘optimal’’ tax system. One reason for this discrepancy may be that politicians strive for other objectives rather than making tax rules that comply with the theoretical concepts of optimal taxation. In this...

Since the pioneering work of Embrechts and co-authors in 1999, copula models have enjoyed steadily increasing popularity in finance. Whereas copulas are well studied in the bivariate case, the higher-dimensional case still offers several open issues and it is far from clear how to construct...