A host of issues continue to limit understanding of the role housing markets play in the dynamics of financial markets, labour markets, and the wider macro economy. Mortgage and bankruptcy constraints, individual tenure and portfolio choices, potential frictions in the labour, housing and mortgage markets remain promising avenues for theoretical and empirical research and debate. Arguments about policies often hinge on particular modelling assumptions. Which assumptions are of first-order importance? Microdata or theoretical models that shed light on these issues are sought.