Define greed.
“...the inordinate love for riches. Its special malice, broadly speaking, lies in that it makes the getting and keeping of money, possessions, and the like, a purpose in itself to live for. It does not see that these things are valuable only as instruments for the conduct of a rational and harmonious life, due regard being paid of course to the special social condition in which one is placed.”
None of that is required for a free market, unless you think like Michael Moore and define Bernie Madoff as the prime example of Capitalism.