The IMF Working Papers series is designed to make IMF staff research available to a wide audience. Almost 300 Working Papers are released each year, covering a wide range of theoretical and analytical topics, including balance of payments, monetary and fiscal issues, global liquidity, and national and international economic developments.
Mohamed El Harrak, Antonio David, Lorraine Ocampos, and Marshall Mills
INTERNATIONAL MONETARY FUND
This paper addresses a number of issues regarding petroleum product pricing in Western Africaemphasizing international spillovers. We use panel unit root rests and long-run modeling based on vector error correction models to assess links and convergence in petroleum product prices across countries. Our results indicate that in general over the long-run there is convergence in prices across the countries. The estimation results for gasoline and diesel prices suggest the presence of long-run links between retail prices among the different country groupings with long-run multipliers ranging from 11 to -6.66. The speed of Adjustment to equilibrium varies significantly according to the countrygroupings considered. In contrast, the econometric results for kerosene prices not only indicate a weaker link between prices across countries, but also a much slower adjustment to equilibrium. Inlight of these important spillovers, the need to better coordinate pricing s and tax policies towards petroleum products at the regional level becomes apparent.