For example, fast-growing cities in Viet Nam, as elsewhere, lack public transport to accommodate travel from suburb to suburb as opposed to a purely radial system designed to move people only between a given suburb and the core of the city. In addition, silo approaches, in which the transport sector lacks co-ordination with other sectors such as construction, land use and housing development, often create a spatial mismatch between the demand and supply of public transport, resulting in inefficient public transport networks and perpetuating inequality'. Housing will be built in areas where land is cheaper, meaning most frequently that low-income residents will be located in outlying and peripheral areas where public transport is either non-existent or is so expensive that ridership is limited and investment is accordingly difficult to mobilise. Indeed, nearby municipalities may come into conflict with one another if they perceive that a neighbour is lacking in commitment to transport integration or is unwilling to invest in a way that is equitable to all partners.