Ezra Klein makes a good point on his blog:
"The ER is the most Marxist building in the modern American hospital. By law, it treats anyone who decides to bleed in the waiting room, no matter their ability to pay, thus fulfilling the 'From each according to his ability' requirement. It parcels out medical attention based on severity of condition rather than thickness of wallet, thus fulfilling the 'to each, according to his need' requirement. It's a socialists redoubt in a capitalist system."