Empirical tests of purchasing power parity (PPP) are implicitly based on the conditions of symmetry and proportionality of the price coefficients. We investigate a separate condition, which we term homogeneity. Specifically, while there may be factors that drive a wedge between prices and...

This paper introduces this special issue of Economic Modelling which marks the significant contribution made by P.A.V.B Swamy to econometrics. His work spans almost 50 years and has been both innovative and challenging. The many distinguished authors who have contributed to this volume...

The method of instrumental variables (IV) and the generalized method of moments (GMM), and their applications to the estimation of errors-in-variables and simultaneous equations models in econometrics, require data on a sufficient number of instrumental variables that are both exogenous and...

We investigate the impact of the economic fundamentals, sovereign credit ratings, political uncertainty, and the ECB’s Securities Markets Program (SMP) on Greek sovereign spreads. Our findings show that sovereign downgrades and political uncertainty appear to have been drivers of the sharp...

The method of instrumental variables (IV) and the generalized method of moments (GMM), and their applications to the estimation of errors-in-variables and simultaneous equations models in econometrics, require data on a sufficient number of instrumental variables that are both exogenous and...

During the euro-area financial crisis, interactions between sovereign spreads and credit ratings appeared to have led to self-generating feedback loops. To examine the interaction between spreads and ratings, we estimate a simultaneous two-equation model in which spreads and ratings are...

We quantify the linkages among banks’ equity performance and indicators of sovereign stress by using panel GMM to estimate a three-equation system that examines the impact of sovereign stress, as reflected in both sovereign spreads and sovereign ratings, on bank share prices. We use data for a...