If government were to maintain their proper role, which is protection of private property rights (for ALL individuals, not just corporations and the state, including the right to not have your neighbor pollute your land, water or air), enforcement of voluntary contracts, and defense from foreign aggression (NOT empire building), a free market system is the only just system. If by greed, you mean I want the best for myself and my family, then so be it.
That being said, I leave it for a much greater writer than I:
"The modern socialist factions ceaselessly oppose free association in present-day society. They do not realize that a free society is a true association much superior to any of those that they concoct out of their fertile imaginations.
Let us elucidate this point with an example:
For a man, when he gets up in the morning, to be able to put on a suit of clothes, a piece of land has had to be enclosed, fertilized, drained, cultivated, planted with a certain kind of vegetation; flocks of sheep have had to feed on it; they have had to give their wool; this wool has had to be spun, woven, dyed, and converted into cloth; this cloth has had to be cut, sewn, and fashioned into a garment. And this series of operations implies a host of others; for it presupposes the use of farming implements, of sheepfolds, of factories, of coal, of machines, of carriages, etc.
If society were not a very real association, anyone who wanted a suit of clothes would be reduced to working in isolation, that is, to performing himself the innumerable operations in this series, from the first blow of the pickaxe that initiates it right down to the last thrust of the needle that terminates it.
But thanks to that readiness to associate which is the distinctive characteristic of our species, these operations have been distributed among a multitude of workers, and they keep subdividing themselves more and more for the common good to the point where, as consumption increases, a single specialized operation can support a new industry. Then comes the distribution of the proceeds, according to the portion of value each one has contributed to the total work. If this is not association, I should like to know what is.
Note that, since not one of the workers has produced the smallest particle of raw material from nothing, they are confined to rendering each other mutual services, to aiding each other for a common end; and that all can be considered, each group in relation to the others, as middlemen. If, for example, in the course of the operation, transportation becomes important enough to employ one person; spinning, a second; weaving, a third; why should the first one be considered more of a parasite than the others? Is there no need for transportation? Does not someone devote time and trouble to the task? Does he not spare his associates this time and trouble? Are they doing more than he, or just something different? Are they not all equally subject, in regard to their pay, that is, their share of the proceeds, to the law that restricts it to the price agreed upon after bargaining? Do not this division of labor and these arrangements, decided upon in full liberty, serve the common good? Do we, then, need a socialist, under the pretext of planning, to come and despotically destroy our voluntary arrangements, put an end to the division of labor, substitute isolated efforts for co-operative efforts, and reverse the progress of civilization?"
-Frederic Bastiat