What is the theme in Capitalism and Freedom by Milton Friedman?

The failures of government is another theme in the story. Capitalism and Freedom is not a work that is focused largely on liberal social freedoms as other important books in the classical liberal tradition, such as John Stuart Mill's On Liberty. Rather it is written not by a social philosopher and economist like Mill but, in an age of increasing specialization, it is written by a man who, while a world-class economist, was not a moral philosopher. Consequently, while it sometimes touches on moral matters, it does not develop a principled case for liberty but rather defends capitalism largely on the ground that government fails and markets succeed.