while infrastructure has substantial impacts on growth that may vary across countries time and within infrastructure subsectors see for example estache and garsous and dissou and didic infrastructure development can also promote growth spillovers to neighbouring countries roberts and deichman importantly investments in water supply sanitation and roads are critical to growth and have benefited the poor in east asia and the pacific jones van der geest and nunezferrer at the country level numerous studies have shown that infrastructure development leads to sustained economic growth and is a significant factor for reducing poverty