GDP is a flow (depends on our arbitrary convention of splitting time into years). Market cap is a stock. Comparing one to the other is like comparing a bathtub

GDP is a flow (depends on our arbitrary convention of splitting time into years). Market cap is a stock. Comparing one to the other is like comparing a bathtub that holds 100 litres to a hosepipe that discharges 1 litre per minute (or is that 60 litres / hour?).