Optimists reckon that India's trajectory is self-correcting. Its messy democracy may not give it the sense of purpose that China's one-party state does. But if the economy gets wobbly enough, the politicians will eventually react, pushing through painful reforms that will keep India's miracle intact. That cheery logic is being put to the test this week, as a proposal to let foreign supermarkets into the country has provoked an almighty row.
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