Book excerpt: Urban sprawl � low-density subdivisions and business parks, big box stores and mega-malls � has increasingly come to define city growth despite decades of planning and policy. In Perverse Cities, Pamela Blais argues that flawed public policies and mis-pricing create hidden, "perverse" subsidies and incentives that promote sprawl while discouraging more efficient and sustainable urban forms � clearly not what most planners and environmentalists have in mind. She makes the case for accurate pricing and better policy to curb sprawl and shows how this can be achieved in practice through a range of market-oriented tools that promote efficient, sustainable cities.