One of the big global headlines this week was a report by the global advocacy Oxfam that points to how inequality has steadily worsened - about a handful of people own as much as the bottom half of the world - a report meant to coincide with the World Economic Forum at Davos. The report once again underlines how inequality remains a burning challenge to the world - not just in poorer countries like India, but even developed ones. This week, we examine the riddle of inequality: why is inequality, despite all the hand-wringing over it - on the rise? How does this tally with the decline in poverty? What sort of threat does it pose to India and the world? And how do you get rid of it?