Quick Google search, nearly top result. Committing the sin of just reading the headline but man this is not hard to find evidence: https://www.bloomberg.com/news/articles/2019-03-28/economist...

Or maybe? https://fivethirtyeight.com/features/economists-are-bad-at-p...

"All of the gains are from big tech". All of the gains are always from some companies and all of the losses are always from others. This is just how the pie got sliced 2020. I don't think it has any special meaning we can divine from it?