Of course assessing "one's own 'greed content'" isn't an exact science either. I'd guess that the idea of greed suffers from a problem similar to that of honesty.
Defending one's own relative greed-lessness? is akin to saying, Look.. I'm Honest. [we see why that fails - recursively] There's always a yabut since.. most any Murican possesses orders of magnitude more wealth (via any formula) than a humongous percentage of all homo-saps (present, or who ever lived).
By that criterion (and our rapacity, now hegemony to date) one might determine that we are Tribbles: born
Ashton Murican ergo Greedier than most bipeds extant.