SMU Lee Kong Chian Professor of Marketing Nirmalya Kumar has been observing the ups and downs of the retail business for decades – from Amazon’s pioneering of ecommerce to the recent rise of quick commerce. In his recently published book Clash: Amazon versus Walmart, Prof Kumar analysed how two of the world’s largest companies run the retail industry. He shared his views about disruptions in the retail space, quick commerce companies and how big Indian conglomerates like the Tata Group and Mukesh Ambani’s Reliance fare in the battle against Amazon and Walmart-owned Flipkart.