Federal housing vouchers are the largest rental aid program, but many landlords reject them. Experiments will test whether cash helps more people sign a lease.

Pulitzer winner for Evicted Matthew Desmond examines why the U.S. has more poverty than other rich nations. He finds it spends big on social programs, but gives the most to those who need it least.

The federal government plans to release $5 billion in new housing vouchers to help those at risk of homelessness. Low-income tenants often struggle to find landlords who will accept such vouchers.