Mauritania requested capacity development from the Fiscal Affairs Department on carbon taxation, fossil fuel pricing and fiscal aspects of hydrogen development. This is a high-level summary of the technical assistant and the recommendations provided to the authorities. The report assesses...

La Mauritanie a sollicité auprès du Département des finances publiques un renforcement de ses capacités en matière de taxation du carbone, de tarification des combustibles fossiles et d'aspects fiscaux du développement de l'hydrogène. Ceci est une synthèse générale de l'assistance...

Japan's unemployment rate remains relatively low compared to other OECD countries. However, Japan's poverty rate among the working-age population is one of the higher ones among OECD countries. The public assistance program in Japan does not provide adequate income support for the working poor...

The benchmark optimal income taxation model of Mirrlees (1971) finds that the optimal marginal income tax rate (MIT) is always non-negative. A key model assumption is the coincidence between social and individual work preferences. This paper extends the model to allow for differences in social...

In an influential paper, Kaplow and Shavell (Journal of Political Economy, 2001) propose and prove a proposition that “Any non-welfarist method of policy assessment violates the Pareto principle.” In this paper, I first make a counter example to prove that their proposition is false. I also...