Part 2 of Piketty's book deals with the relationship between capital and income over time. There are fluctuations, there are differences between countries, and some forms of capital have changed in importance: agricultural land, for instance, has shrunk to a tiny proportion of the overall capital of the countries investigated. Still, the overall trajectory is pretty clear: capital is on the rise. Piketty cautions that "there is no natural force that inevitably reduces the importance of capital ... over the course of history" (p234).
One contention that should resonate with Pirates is that "technology, like the market, has neither limits nor morality". Piketty clarifies this by arguing that "Progress toward economic and technological rationality need not imply progress toward democratic and meritocratic rationality", and hence that "If one truly wishes to found a more just and rational social order based on common utility, it is not enough to count on the caprices of technology".