India, Aug. 19 -- In almost every Indian city, there is a family the country needs to talk about. The father pays his income tax in full, on time, every year. The mother has taken a loan for their daughter's engineering degree. There is an insurance premium due each March against an illness they hope never comes. This family asks the government for very little. It is the Indian middle class, and it has quietly become the engine of the country's economy - and the government's own record over the past decade shows it understands that the next phase of reform must focus on this family. Yet, few people realise just how powerful this engine has become. Speaking in France earlier this year, the finance minister pointed out that India's middle c...