Ant Group is the business magnate Jack Ma's fintech subsidiary, the company behind the ubiquitous 'Alipay' app, which has one billion users. Last week, it was due to begin trading on the Shanghai and Hong Kong stock exchanges. Set to raise US$37 billion, it would have been the biggest IPO ever. But at the eleventh hour, the Chinese government scuppered the plans with crippling new financial reforms. So why won't China allow this homegrown fintech champion to go global? Rumours abound that Ma stepped on the wrong toes. Cindy Yu speaks to Duncan Clark, author of Alibaba: The House that Jack Ma Built, on this episode.