The average US net-worth is around 700k. That of course doesn't mean 700k annual income. But still a crazy figure when compared to the median net-worth of roughly 120k
GDP is 23.32 trillion. Population is 331.9 million. If the GDP were literally split evenly among every single person including children, it's about $70k annually. My guess is that they were doing this and flubbed the math.
Yeah but what about capital gains and other non-work related sources of income?