Through these instruments rents are set below-market levels and the duration of contract is longer than what mandated by law for private rental contracts, in exchange for rental income tax relief. Social Rental Agencies (SRAs) also take on this role in some countries, SRAs are non-profit organizations that act as intermediaries between private landlords and vulnerable tenants providing guarantees to the landlords (typically rent payments, management and administrative tasks, and physical quality of the dwelling) and support services to tenants. Evidence shows that landlords capture a sizeable share of public housing allowances by raising rents in Finland (Kangasharuju 2010, Viren 2011), France (Fack 2005, LaFerrere and Le Blanc 2004), the United Kingdom (Gibbons and Manning 2006), and the United States (Susin 2002).