The contract also establishes the degree to which the PPP facility is separated from existing networks, often politically controversial in urban areas, and the level of charges that can be levied are also a politically sensitive issue. In Tokyo and other large Japanese cities, private metro and suburban rail operators carry a larger share of passengers than government financed metros or the suburban lines of the regional railways, and they return consistent profits. These networks were developed in a set of unique post-war conditions characterised by cheap land prices (allowing the operators to buy entire corridors and surrounding properties) and low labour costs coupled with directive land-use planning. Today, most of their revenue comes from non-transport operations linked to their real-estate holdings and in-station shops.