 Opponents also state categorizing patients based on factors such as social value to the community or age will not work in a heterogeneous society without a common ethical consensus such as the U.S. Doug Bandow of the CATO Institute wrote that government decision making would "override the differences in preferences and circumstances" for individuals and that it is a matter of personal liberty to be able to buy as much or as little care as one wants.Neither argument recognizes the fact that in most countries with socialized medicine, a parallel system of private health care allows people to pay extra to reduce their waiting time.The exception is that some provinces in Canada disallow the right to bypass queuing unless the matter is one in which the rights of the person under the constitution.