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∗Integrated Research System for Sustainability Science, The University of Tokyo 7-3-1 Hongo, Bunkyo-ku, Tokyo 1133-8654, Japan E-mail: geetha@ir3s.u-tokyo.ac.jp ∗∗Graduate School of Frontier Sciences, The University of Tokyo, Japan E-mail: matsuda@k.u-tokyo.ac.jp ∗∗∗Department of Agriculture and Resource Economics, University for Development Studies (UDS), Ghana E-mail: sammidonkoh@yahoo.com, vlolig@uds.edu.gh, nanayawdansoabbeam@gmail.com

Effects of Research and Development Expenditure and Climate Variability on Agricultural Productivity Growth in Ghana