Just as the existential question of why individuals succeed and fail, vexes every aspect of both public policy and personal debate, so to with nations. History tells us of the rise and fall of nations. In so doing it gives us clues about economics, demographics, planning and even how the individual drive for success scales up to impact whole nations.

But of course, like everything else, we seek clear and precise metrics to try and make business decisions, geopolitical policy decisions, and simply anticipate the future in order to make a better world.

Ruchir Sharma, the Head of Emerging Markets and Chief Global Strategist at Morgan Stanley, tries to do this in The Rise and Fall of Nations: Forces of Change in the Post-Crisis World.

My conversation with Ruchir Sharma: