t certainly took everyone in India by surprise. But then, Prime Minister Narendra Modi has a flair for the dra matic. In an unexpected prime time ad- dress on Tuesday, he announced that in a few hours, millions of high-denomination currency notes would no longer be legal tender. It was the only way, he insisted, to deal with "the disease" of unaccounted- for income or "black money" as it's called in India. "Your money will remain yours," he assured a stunned citizenry as long as you get around to depositing it in post offices sometime over the next several weeks. As with everything the Indian govern ment does, there's a complex system of exemptions and exceptions to this demon- etisation. If you're in an accident, for exam ple, you can still pay the emergency room in 1,000-rupee notes. Also, for some reason, if you want to buy milk. Meanwhile, wi drawals from ATMs have been limited to