The cartoon brilliantly satirizes blood type compatibility through economic metaphors. O-negative, the universal donor who can give to anyone but only receive from itself, is depicted as charitably giving money to the poor. Meanwhile, AB-positive, the universal recipient who can receive from any blood type but only donate to itself, is shown hoarding cash like a greedy banker. It's hematology's perfect parallel to wealth distribution. The next time someone with AB+ tries to claim moral superiority, just silently hand them this cartoon and walk away.