Inter-Regional Wage Differentials in Portugal: An Analysis Across the Wage Distribution

Typically, studies on regional wage differentials are based on ordinary least squares (OLS) estimates. Quantile regression is an alternative approach which allows these differences to be studied across the whole wage distribution. In this study, the quantile regression framework is considered for the analysis of regional wage differences in Portugal. The findings reveal significant differences in wage equations coefficients between regions for the various quantiles. Furthermore, it is concluded that the regional wage differentials and the components explained by differences in endowments and differences in returns increase across the whole wage distribution

The economic theory and the Portuguese manufactured industry. Another approach

The aim of this paper is to present a further contribution to the analysis of absolute convergence, associated with the neoclassical theory, of the manufactured industry productivity at regional level and for the period from 1995 to 1999 (1)(Martinho, 2011a). This work aims, also, to test the Verdoorn Law, with the alternative specifications of (2)Kaldor (1966), for the five Portuguese regions (NUTS II), from 1995 to 1999. It is intended to test, yet in this work, the alternative interpretation of (3)Rowthorn (1975) about the Verdoorn's Law for the same regions and period (4)(Martinho, 2011b). This paper pretends, yet, to analyze the importance which the natural advantages and local resources are in the manufacturing industry location, in relation with the "spillovers" effects and industrial policies. To this, we estimate the Rybczynski equation matrix for the various manufacturing industries in Portugal, at regional level (NUTS II) and for the period 1995 to 1999 (5)(Martinho, 2011c)

On Portfolio Choice, Liquidity, and Short Selling: A Nonparametric Investigation

This paper studies the time series effect of changes in liquidity on optimal portfolio allocations. Using a nonparametric approach, we are able to handle models that are analytically intractable. Specifically, we directly estimate optimal portfolio weights for a CRRA investor as functions of liquidity. Liquidity is measured by turnover, dollar volume, or price impact. We consider three different investment horizons: daily, weekly, and monthly. Using a sample of NYSE stocks from 1963-2000, we document a very interesting temporal dimension to the effects of changes in liquidity: whereas optimal weights are strongly increasing functions of liquidity at the very short daily and weekly horizons, they become decreasing functions of liquidity at longer monthly horizons. Overall, the dependence of optimal weights on liquidity is most noticeable for small stocks at short investment horizons. Finally, the optimal conditional portfolio weights documented in this paper are never negative, which may help explain the low level of short selling observed in the US stock market. Nous estimons des décisions de choix de portefeuille en fonction de mesures de liquidité à l'aide de méthodes non paramétriques. Nous trouvons que les parts optimales de portefeuilles sont surtout influencées par la liquidité pour des horizons à court-terme. Par ailleurs, ces parts optimales sont toujours positives, ce qui pourrait expliquer le peu de vente à découvert observé sur le marché américain.portfolio choice, liquidity, short-selling, choix de portefeuille, liquidité, vente à découvert

InterRegional Wage Differentials in Portugal: An Analysis Across the Wage Distribution

TTypically, studies on regional wage differentials are based on OLS estimates and use Blinder (1973) and Oaxaca (1973) decomposition. Quantile regression is an alternative approach which allows for studying these differences across the whole wage distribution. In this study, the quantile regression framework is considered for the analysis of regional wage differences in Portugal. Our findings reveal significant differences in wage equations coefficients between regions for the various quantiles. Furthermore, we conclude that the regional wage differentials and the components explained by differences in endowments and differences in returns increase across the whole wage distribution.Regions; Wage differentials; Quantile regression; Quantile-based decompositions.

Regional agglomeration in Portugal: a linear analysis

This work aims to study the Portuguese regional agglomeration process, using the linear form the New Economic Geography models that emphasize the importance of spatial factors (distance, costs of transport and communication) in explaining of the concentration of economic activity in certain locations. In a theoretical context, it is intended to explain the complementarily of clustering models, associated with the New Economic Geography, and polarization associated with the Keynesian tradition, describing the mechanisms by which these processes are based. As a summary conclusion, we can say which the agglomeration process shows some signs of concentration in Lisboa e Vale do Tejo (which is evidence of regional divergence in Portugal) and the productivity factor significantly improves the results that explain the regional clustering in Portugal (despite being ignored in the models of New Economic Geography).agglomeration; Portuguese regions; linear models

The Economic Theory and the Portuguese Manufactured Industry

This work aims to compare the Keynesian theory, namely by the Verdoorn Law, the neoclassical theory, by the absolute convergence, and the geographic concentration, by the Rybczynski equation, explanations about the different manufactured industry of the Portuguese regions (NUTs II), for the period 1986-1994. The Verdoorn Law, is tested with the alternative specifications of Kaldor (1966. The absolute convergence is tested for the productivity. To analyze the geographic concentration, with Rybczynski equation, is tested the importance which the natural advantages and local resources are in the manufacturing industry location, in relation with the "spillovers" effects and industrial policies. --Verdoorn law,convergence theories,geographic concentration,panel data,manufactured industries,Portuguese regions

The convergence theories and the geographic concentration in the Portuguese manufactured industry

The aim of this paper is to present a further contribution to the analysis of absolute convergence, associated with the neoclassical theory, of the manufactured industry productivity at regional level and for the period from 1986 to 1994 (1)(Martinho, 2011a). This paper pretends, also, to analyze the importance which the natural advantages and local resources are in the manufacturing industry location, in relation with the "spillovers" effects and industrial policies. To this, we estimate the Rybczynski equation matrix for the various manufacturing industries in Portugal, at regional level (NUTS II) and for the period 1986 to 1994 (2)(Martinho, 2011b).convergence; geographic concentration; panel data; manufactured industries; Portuguese regions