“…Ideally, progressivity can be measured by considering all diverse tax payments across different economic groups (Piketty and Saez 2007;Prasad and Deng 2009;Saez and Zucman 2019). Given the difficulty of producing such extensive tax data across countries, Japanese and Korean studies have instead focused on certain progressive tax categories, such as personal and corporate income taxes, and analyzed their statutory or marginal rates across different income groups and countries (Choi et al 1991;De Mooij and Saito 2014, 5-7; Dewit and Steinmo 2002, 163; Dalsgaard and Kawagoe 2000, 41;Dalsgaard 2000, 42, 51, 54;Ide and Steinmo 2009, 130;Kim 2009, 208;Kim, M.-K. 2018, 274). While this approach appears practical from a comparative perspective, its narrow focus on progressive taxes has resulted in an uncomprehensive assessment of the overall progressivity of taxation.…”