I posted this comment elsewhere, and thought it worth sharing here:
I've not read far into the book yet -- and it is available online as a PDF file -- but by the time I was into the first chapter, it was clear that Dr. Piketty's economic education, extensive as it might be, entirely omitted the ideas of the classical economists who described a 3-factor economy: land, labor and capital. Piketty, like nearly everyone educated in economics in the past 40 to 80 years, writes as if there were only two factors -- labor and capital -- treating land as if it were a mere subset of capital, with no reason to recognize it as differentiated.
Land -- not only urban sites, but also the other things the classical economists would recognize as Land, such as water rights, oil, electromagnetic spectrum (our airwaves which we all say belong to the American people, but which are in reality owned by corporations), landing rights at busy landlocked airports, geosynchronous orbits, urban street parking, the value of dozens of other non-renewable natural resources -- is completely different in character from that which is created by labor. To fail to recognize that difference lies at the bottom of our inequality problem.
That which individuals and corporations produce is rightly individual property. That which the community and nature produce is rightly common property, belonging to all of us. Conflating Capital and Land leads us to permit the privatization of that which is rightly our common treasure.
You might be interested to know that the Landlord Game, invented by 1902, was intended to teach this concept. You have probably played Monopoly, which was based on this game, played with very different rules.
Explore the ideas of Henry George. Between 1885 and 1900 or so, everyone knew the name and many well understood his ideas. You might start with "Social Problems" or the more analytical "Progress and Poverty," or his speeches, "The Crime of Poverty," "Thou Shalt Not Steal," among others, online at http://www.wealthandwant.com. See also http://lvtfan.typepad.com.
Dr. Piketty and others whose education in economics has omitted George's ideas should not be treated as experts; they've mixed apples and oranges and not noticed that what they've created impoverishes the vast majority of us -- and enriches a few. (Parenthetically, consider who donates heavily to our universities.)