MAHATMA GANDHI believed it was difficult to conduct business in a strictly honest way. In India it has become hard to conduct business any way at all. It sits a lowly 142nd out of 189 countries in the World Bank’s ease-of-doing-business rankings. The country’s present-day boosters say a huge market of 1.25 billion people, half of them under 27, will continue to draw big companies to invest there, whatever the difficulties. Yet though India is a big market, it is not a uniform one. Each of its 29 states has its own rules on land purchase, employment, tax and the environment. And some states are friendlier to enterprise than are others.