Also to add: Economic growth comes from producing more. "Mean has grown, but median has stagnated" means top earners are producing more (e.g. better software &

Also to add: Economic growth comes from producing more. "Mean has grown, but median has stagnated" means top earners are producing more (e.g. better software & hardware), while below-median earners aren't necessarily producing more (think of the services sector). If efficiency doesn't go up, incomes may and do remain stagnant.