In my opinion, Market Cap and GDP aren’t comparable.  Compare their Revenue with GDP.  Total Revenue of FANGMAN is US$ 0.975 Trillion.  $FB: $73 B $AMZN: $296 B $NFLX: $21 B $GOOG: $166 B $MSFT: $139 B $AAPL: $268 B $NVDA: $12 B  $WMT (Walmart) has maximum revenue $524B.