The aim of this article is to provide additional evidence on the fulfilment of the Purchasing Power Parity (PPP) hypothesis in the so-called Mediterranean countries. In order to test for the empirical validity of such a hypothesis, we have applied two types of unit root tests. The first group is...

This paper re-examines CO2 emissions in 22 OECD countries over the period 1870–2006. It contributes to the field of environmental economics trying to clarify the possible sources of the mixed evidence on CO2 emissions convergence. To this end we employ a detailed methodological strategy. First...