There is no way to conveniently do "select sum(payment_amount) where country = 'US' AND was_fraudy from the_global_economy" but it's broadly estimated at +/- $1

There is no way to conveniently do "select sum(payment_amount) where country = 'US' AND was_fraudy from the_global_economy" but it's broadly estimated at +/- $10B, which is why why I said it was on the scale the gold mining industry, which I quoted. You're welcome to Google various estimates, though they'll end up over the map in the low 10 digits region.