The strength and direction of the Indian economy may be up for debate, but one remarkable fact is not: There has been massive growth in the number and wealth of billionaires in India since the economic liberalization measures in 1991.

The phenomenon has often been compared to the United States' experience in the latter part of the 19th century. This was a period evocatively described by Mark Twain and Charles Dudley Warner as America's "Gilded Age," a time characterized by industrialists so wealthy and powerful that they came to be pejoratively called "robber barons."