The difference/contrarian interpretation of the green belt's effects/motivation (for example, suggested by economist Tim Harford[7]) is that a green belt is created by residents to preserve the bourgeois status quo of those already living within the zone, and especially the advantage of landlords who profit from a scarcity of housing (see above, "preserving the character of rural communities"). The stated motivation and benefits of the green belt might be well-intentioned (public health, environment), but these benefits do not accrue as intentioned or claimed (for example, critics such as Mark Pennington[8] claim that only a small fraction of the population ever sets foot on the green belt for leisure purposes, and they claim that a green belt is not strongly causally linked to clean air and water). Rather, the ultimate result of the decision to green-belt a city is to prevent housing demand within the zone to be met with supply,[8] thus exacerbating high housing prices and stifling competitive forces in general.
Another area of criticism comes from the fact that, since a greenbelt does not extend indefinitely outside a city, it spurs the growth of areas much further away from the city core than if it had not existed, thereby actually increasing urban sprawl.[9] Examples commonly cited are the Ottawa suburbs of Kanata and Orleans, both of which are outside the city's greenbelt, and are currently undergoing explosive growth (see Greenbelt (Ottawa)). This leads to other problems, as residents of these areas have a longer commute to work places in the city and worse access to public transport. It also means people have to commute through the green belt, an area not designed to cope with high levels of transportation. Not only is the merit of a green belt subverted, but the green belt may heighten the problem and make the city unsustainable.
There are many examples whereby the actual effect of green belts is to act as a land reserve for future freeways and other highways. Examples include sections of the 407 highway north of Toronto and the Hunt Club Rd / Richmond Rd. south of Ottawa. Whether they are originally planned as such, or the result of a newer administration taking advantage of land that was left available by its predecessors is debatable.
In Britain, greenbelt barriers to urban expansion have been criticised as one of several protectionist political-economic barriers to housebuilding with negative effects on the supply, cost/prices, and quality of new homes. Critics argue that the greenbelts actually defeat their own stated objective of saving the countryside and open spaces. By preventing existing towns and cities from extending normally and organically, they result in more land-extensive housing developments further out – i.e., the establishment beyond the greenbelts of new communities with lower building densities, their own built infrastructure and other facilities, and greater dependence on cars and commuting, etc. Meanwhile, valuable urban green space and brownfield sites best suited to industry and commerce are lost in existing conurbations as more and more new housing is crammed into them.[10]