The term 'double billing' refers to physicians who bill for services rendered under MSP and who bill for services rendered outside of that plan. If we are going to forbid such practice it would mean that no one working on contract to the federal government would be able to work for anyone else. The public does not own doctors or control what doctors do with the surplus hours they have after those consumed in our rationed system. The government does not have the funds to pay for all of the doctors' time so why should they be forbidden to sell it on a free market basis? It is not a matter of those who 'have money' getting better care - it is a matter of allowing people to purchase time and treatment that would otherwise go to waste. Double billing has no impact on the public system given that the services provided are surplus to what it can afford.