Notes, Comments and Preliminary results Apr 30 2018 Shigeo Morita and Takuya Obara   Optimal capital income taxation in the case of private donations to public goods   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result   Dec 28 2017 Shigeo Morita   Optimal income taxation without commitment: policy implications of durable goods   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result