What are causes of shelter shortages in the world?

Shelter shortages in the world are primarily driven by rapid urbanization, where increasing populations in cities outpace the availability of affordable housing. Economic factors, such as poverty and income inequality, further exacerbate the issue, limiting access to adequate housing for low-income families. Additionally, natural disasters, armed conflicts, and climate change displace communities, leading to an increased demand for shelter that often cannot be met. Lastly, inadequate government policies and investment in housing infrastructure contribute to the persistent shelter crisis.