 American right-libertarian George Leef attacked Piketty's work as "an apology for the use of state coercion to take property away from some people who supposedly have too much", which in the words of Frédéric Bastiat he calls "legal plunder".Diverting more resources from the voluntary, "generally efficient" private sector and into the coercive, "generally inefficient" government sector, he says, was a bad trade-off, especially for poorer people.Lawrence Summers criticizes Piketty for underestimating the diminishing returns on capital, which he believes will offset the return on capital and hence set an upper limit to inequality.