“…The impact of the single market on housing policies is unclear. Most literature focuses on the fact that the production of new affordable housing is affected significantly by policies on state aid (Adair, Berry, & McGreal, 2003;Colomb and Santinha, 2014;Elsinga, Haffner, & Van der Heijden, 2008;Korthals Altes, 2014b;Priemus and Gruis, 2011;Taşan-Kok, Groetelaers, Haffner, Van der Heijden, & Korthals Altes, 2013). However, other single market policies, such as public procurement (Korthals Altes, 2006;Korthals Altes, 2014a;Taşan-Kok and Korthals Altes, 2012) and the four freedoms À the free movement of goods, capital, persons and the freedom of establishment, including the freedom to provide services (Dimitrova, 2013;Haffner and Hoekstra, 2006) À may also have an impact on housing provision.…”