What drives idiosyncratic volatility over time?

We document the patterns of market-wide and firm-specific volatility in the Portuguese stock market over the 1991–2005 period and test several explanations for the behavior of firm-level idiosyncratic volatility. Unlike previous studies we find no evidence of a statistically significant rise in firm-specific volatility. On the contrary, the ratio of firm-specific risk to total risk slightly decreases. We show that this result stems from new listings of large privatized companies that display lower firm-specific risk. Our findings are consistent with the idea that changes in idiosyncratic volatility are related to changes in the composition of the market.

Competition in the Portuguese economy: insights from a profit elasticity approach

The article uses the elasticity of profits to marginal costs, as in Boone (Econ J 111:1245–1261, 2008b), to measure the degree of competition in the Portuguese economy in a period characterised by the reallocation of resources towards the non-tradable sector and the accumulation of macroeconomic imbalances. Using firm-level data for the period 2000–2009, we find that there is lower competition intensity in the non-tradable sector. The least competitive markets within this sector lay in professional services, network industries and segments of retail trade. We also find that reductions in competition intensity are relatively widespread in the economy, but in terms of sales, gross value added and employment they are more substantial in the non-tradable sector. Results suggest that some network industries and other services exhibit low and a declining competition intensity in the period under analysis. In addition, the article discusses the coherence of the profit elasticity with classic indicators of market power, such as the Herfindahl–Hirschman index and the price-cost margin, and find that in more than half of the markets there is an agreement in the dynamics of competition intensity.     

Before ‘Independence’ Arrived: Interdependence in Energy Relations between Lithuania and Russia

This paper analyses energy relations concerning natural gas between Lithuania and Russia. Contrary to the existing literature, which stresses Lithuanian energy dependence, this paper argues that there had been interdependence between the two countries even before Lithuania underwent diversification at the end of 2014. The paper develops an analytical framework that examines: (a) physical energy relations, (b) the dominance of the energy agenda in mutual relations, and (c) the influence of the European Union. The analysis shows that while Lithuania was dependent on Russian supplies of natural gas, Russia was also dependent on Lithuania as a transit country of gas to Kaliningrad, a Russian enclave. Although Russia has shown a much higher willingness to employ an energy weapon than Lithuania, its efforts to exercise pressure on Lithuania have been negatively affected by the Baltic state’s position as a transit country. The European Union has played a crucial role as its pre-accession requirements and internal energy market rules have significantly influenced the energy relationship between the two countries.     

Price versus quantity in a duopoly of vertical differentiation with loss-averse consumers

In a model à la Mussa and Rosen (1978) in which consumers are loss-averse, I check the robustness of the result obtained by Tanaka (2001). As he did, I find that the quantity contract is a dominant strategy for both firms. Thus, Cournot is the outcome in equilibrium. Finally, I find that loss aversion in general intensifies competition.     

Loan price modelling for local governments using risk premium analysis

Previous studies have highlighted the question of government loan interest as one of great current importance. Government borrowing levels are high, and reducing interest payments would generate savings to meet other spending needs and/or to lower taxation, thus supporting the sustainability of public finances. However, no previous study has presented a method for a local government to calculate its own credit risk and thus be in a position to negotiate lower interest rates on its borrowing. This article defines a financial model that enables local governments to estimate the interest rate payable on a bank loan, based on their credit risk premium, in accordance with the Basel II rules and the findings of our empirical study of large local governments.     

Fiscal space on the eurozone periphery and the use of the (partially) balanced-budget multiplier: The case of Spain

This article adopts the “functional finance” approach to consider the utilization of expansive fiscal policies in the members of the European Monetary Union most affected by high unemployment. As they do not have their own monetary policy, fiscal deficits require the issuing of public debt without the support of the central bank. The authors consequently incorporate the notion of a (partially) balanced-budget expansion to achieve the desired stimulus in gross domestic product (GDP) with the least possible effect on public debt. Their proposal is only a sort of “imperfect” balanced-budget expansion: It is based on the idea that simultaneous increases in public revenue and expenditure can boost GDP, but without any pretension of keeping public deficit unchanged. Specifically, the authors use the case of Spain to show that a more expansive fiscal policy is desirable on economic grounds, and that only institutional constraints prevent it. They do it presenting two alternative scenarios for the coming years and analyzing their different impact on unemployment and fiscal sustainability. The first represents a firm commitment to budget consolidation, whereas the second is based on this “imperfect” application of the balanced budget multiplier. The main conclusion is that a more expansive fiscal policy is perfectly compatible with finance sustainability.