In cities like Guntur and Hubli, the unassuming storefronts of More supermarkets seem a world away from the high-stakes battles of global e-commerce. Yet they are the linchpin in one of retail’s most calculated corporate strategies. These stores are the local face of Amazon’s patient conquest of India’s $600 billion grocery market, a prize that has long frustrated foreign players.The strategy is a direct response to India’s notoriously tangled rules on foreign direct investment. For decades, reg...