 Still, socialists point out that capitalism involves some significant inefficiencies. Examples are the underproduction of public goods (such as public transportation and education), the underpricing and overconsumption of natural resources (such as fossil fuels and fishing stocks), negative externalities (such as pollution), the costs of monitoring and enforcing market contracts and private property (given that the exploited may not be so keen to work as hard as their profit-maximizing bosses require, and that the marginalized may be moved by desperation to steal), and certain defects of intellectual property rights (such as blocking the diffusion of innovation, and alienating those who engage in creative activities because of their intrinsic appeal and because of the will to serve the public rather than maximize monetary reward) (Wright 2010: 55–65). Really existing capitalist societies have introduced regulations to counter some of these problems, at least to some extent. Examples are taxes and constraints to limit economic activities with negative externalities, and public funding and subsidies to sustain activities with positive externalities which are not sufficiently supported by the market. But, socialists insist, such mechanisms are external to capitalism, as they limit property rights and the scope for profit maximization as the primary orientation in the organization of the economy. The regulations involve the hybridization of the economic system by introducing some non-capitalist, and even socialist elements.