As a fan of numerology, let me focus on a special number that captures a global trend: call it the lucky number seven. Since the end of last year, we are seven billion people in the world. We produce a total GDP of US$70 trillion (which means that globally per-capita income is US$10,000 on average) and the average life expectancy worldwide is--you guessed it--70 years.
Let’s extend the seven thread: if the world economy grew at seven percent per year, it would double within a decade (because ten years of seven percent growth don’t amount to 70, but 99 percent, due to the compounding effect). Now with population growth at one percent (thankfully not seven), average per capita incomes would increase from US$10,000 to about 18,000. That is quite a jump, and a level of prosperity that few of our parents and grand-parents would never have imagined.
Sadly though, averages will continue to mask wide disparities, both between countries and within societies.