Market participants will be on the alert for signs President Xi Jinping's Covid-zero policy might be nearing the end of its shelf-life when Xi addresses the 20th National Congress of the CPC this weekend. The chip war between the US and China ramped up this week with more restrictions from the US on Chinese semiconductor companies. Another hot CPI reading whipsaws markets. And David Fickling discusses food insecurity. John Authers, Shuli Ren, Tim Culpan and David Fickling join.