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. https://t.co/XnFLoqA4QF