“Black money” — the colloquial name for a vast network of off-the-book cash transactions and unbanked savings — is one of India’s biggest scourges. Amounting to as much as $460 billion a year, bigger than the GDP of Argentina, all that money lies beyond the reach of the tax authorities, creditors and anti-corruption investigators. Efforts Read more about Could India Be the First to Get Rid of Cash?[…]