The non-response rate may also be higher for some income components, such as the income from self-employment and capital income (Verma and Betti, 2010). In practice, country rankings for the inequality of capital income vary considerably when moving from one household survey to another, e.g. from the LIS to the OECD database. The data typically omit those living in institutions, such as old people’s homes, military camps and prisons. They also omit the homeless.