The global tax deal won't help countries to change their tax rates, economist says

A panel moderated by CNBC's Joumanna Bercetche discusses the challenges of global tax reform. Zainab Shamsuna Ahmed, minister of finance for Nigeria, Mathias Cormann, secretary-general at the OECD, Gabriel Zucman, director at the EU Tax Observatory, and Faisal Alibrahim, minister of economy and planning of Saudi Arabia, joined the panel.