Overall, the main argument is based on two (false) claims. First, that capital returns will be high and non-diminishing, relative to other factors, and sufficiently certain to support the capital returns greater than world growth story as a dominant account of economic history looking forward. Second, that this can happen without significant increases in real wages.
Instead of wealth taxes – A more sensible and practicable policy agenda for reducing inequality would include calls for establishing more sovereign wealth funds, which Piketty discusses but does not embrace; for limiting the tax deductions that noncharitable nonprofits can claim; for deregulating urban development and loosening zoning laws, which would encourage more housing construction and make it easier and cheaper to live in cities such as San Francisco and, yes, Paris; for offering more opportunity grants for young people; and for improving education. Creating more value in an economy would do more than wealth redistribution to combat the harmful effects of inequality.