lewrockwell.com/dieteman/dieteman112.html
Excerpt from link above. It really spells out how compatible capitalism and Catholicism are.
2423 The Church’s social teaching proposes principles for reflection; it provides criteria for judgment; it gives guidelines for action: Any system in which social relationships are determined entirely by economic factors is contrary to the nature of the human person and his acts.
2424 A theory that makes profit the exclusive norm and ultimate end of economic activity is morally unacceptable. The disordered desire for money cannot but produce perverse effects. It is one of the causes of the many conflicts which disturb the social order. A system that “subordinates the basic rights of individuals and of groups to the collective organization of production” is contrary to human dignity. Every practice that reduces persons to nothing more than a means of profit enslaves man, leads to idolizing money, and contributes to the spread of atheism. “You cannot serve God and mammon.”
2425 The Church has rejected the totalitarian and atheistic ideologies associated in modem times with “communism” or “socialism.” She has likewise refused to accept, in the practice of “capitalism,” individualism and the absolute primacy of the law of the marketplace over human labor. Regulating the economy solely by centralized planning perverts the basis of social bonds; regulating it solely by the law of the marketplace fails social justice, for "there are many human needs which cannot be satisfied by the market."Reasonable regulation of the marketplace and economic initiatives, in keeping with a just hierarchy of values and a view to the common good, is to be commended.
The economics of the Austrian School, of Carl Menger and Ludwig von Mises, is wholly compatible with this call. The Austrian School does not propose that social relationships be determined only by economic factors. Indeed, it is not clear what that would mean. Instead, the Austrians point out that economics is a matter of human action, and that it is possible to learn truths about economics by studying human actions. Acting human persons are not required to surrender all notions of faith, family, or community.
Similarly, capitalism does not require that profit be the ultimate end of economic activity. Although men and women act for ends, profit is but one possible end of human action, and clearly not the ultimate end (salvation).
Finally, the Austrian view of economics is also compatible with the Church’s declaration that “there are many human needs which cannot be satisfied by the market.” This is manifestly true. Capitalism does not necessitate the idea that all human needs are fulfilled by the market. Instead, capitalism recognizes that the market is very good (indeed, the best system known to man) at fulfilling man’s material needs. As faithful Catholics must recognize, this is not the sum total of human existence.