While what you say is true, one must not forget the effects of Governmental influences on supply/demand economics...as it is very much a factor.
For example:
http://en.wikipedia.org/wiki/M...
Being just one which includes all sorts of permutations on free capitalistic systems, in all sorts of way, which, in reality, are not really "free".
And since most people can understand, and agree, that Governments are quite often influenced by lobbyists and other such ways to promote private companies, that should always also be factored in to supply/demand considerations.
It is much more complex that some think it is.
[and, urgh, who is this typist who now comments about economics?? bleh]