[identity profile] momentsmusicaux.livejournal.com 2010-04-16 11:12 am (UTC)(link)
> Knowing whether a good is rival or not tells you whether you want to use the market (if I were a good economist that would possibly be capital-M Market ;-) to allocate access to that good. If it's rival, then the market is an efficient way of allocating the good;

But something like medicine is clearly a rival good, and yet some people have greater need than others.