Skew Dyck paths,area, and superdiagonal bargraphs

Skew Dyck paths are a generalization of ordinary Dyck paths, defined as paths using up steps  U=(1,1)$U=(1,1)$, down steps  D=(1,-1)$D=(1,-1)$, and left steps  L=(−1,-1)$L=(-1,-1)$, starting and ending on the x-axis, never going below it, and so that up and left steps never overlap. In this paper we study the class of these paths according to their area, extending several results holding for Dyck paths. Then we study the class of superdiagonal bargraphs, which can be naturally defined starting from skew Dyck paths.     

Asymptotic properties of the partition function and applications in tail index inference of heavy-tailed data

The so-called partition function is a sample moment statistic based on blocks of data and it is often used in the context of multifractal processes. It will be shown that its behaviour is strongly influenced by the tail of the distribution underlying the data both in independent identically distributed and weakly dependent cases. These results will be used to develop graphical and estimation methods for the tail index of a distribution. The performance of the tools proposed is analysed and compared with other methods by means of simulations and examples.     

Corporate governance and IPO underpricing: evidence from the italian market

Journal of Management and Governance - This paper aims to analyse the impact of firms’ corporate governance characteristics on the degree of first-day returns (i.e., underpricing) in the...     

Determinants of Foreign Workers’ Wages in Two Italian Regions with High Illegal Immigration

Since the end of the 1970s Italy has moved from being an out-migration country to being a foreign immigration country, but very few studies have addressed the factors determining the wages of immigrant workers, owing to the lack of available data. In this paper we analyse the determinants of the wages of immigrants in some areas of Latium and Campania, where the share of illegal immigration is relatively high, using the results of a set of sample surveys which collected information on several aspects of the immigration process in the years 1993–94. The purpose of the article is to shed some light on the factors underlying wage distribution among the immigrants using an estimation method that controls for sample selection problems. According to the empirical results, income differences seem to be relatively high among immigrants. Differences in labour market integration among sexes and area of origin clearly emerge from the results. Moreover, legal status plays an important role in the explanation of the wage gap between documented and undocumented immigrants, also because of the different occupational sector structure in the two groups.     

Demographic Trends and Pension System in Italy: an Assessment of 1990s Reforms

Abstract. In the last decade the Italian pension system underwent many changes. The process has started in 1992 with three major reform laws (passed in 1992, 1995 and 1997), supplemented by many other minor changes. Among the innovations introduced in the pay‐as‐you‐go social security system, the most important one is the more explicit link between pensions and contributions, and pensions and life expectancy at retirement. The purpose of this paper is to provide an assessment of both the short‐term and the long‐term effects of the social security reforms on pension expenditure. Notwithstanding the slowdown in the growth rate of the pension expenditure/GDP ratio, the measures adopted so far will not be sufficient to eliminate the existing social security deficit in the next decades, particularly under the assumption of moderate economic performance and rapid population ageing. Reducing public pension expenditure requires the completion of the 1995 reform, a more rapid move towards a multi‐pillar pension scheme, and the implementation of the much needed growth‐enhancing structural reforms.