Mortgage credit expansion policies -such as UK's Help to Buy (HtB) -aim to increase access to and affordability of owner-occupied housing and are widespread around the world. We take advantage of spatial discontinuities in the HtB equity loan scheme, introduced in 2013, to explore the causal economic impacts and the effectiveness of this type of policies. Employing a Difference-in-Discontinuities design, we find that HtB increased house prices by more than the expected present value of the implied interest rate subsidy and had no discernible effect on construction volumes in the Greater London Authority (GLA), where housing supply is subject to severe long-run constraints and housing is already extremely unaffordable. HtB did increase construction numbers without affecting prices near the English/Welsh border, an area with less binding supply constraints and comparably affordable housing. HtB also led to bunching of newly built units below the price threshold, building of smaller new units and an improvement in the financial performance of developers. We conclude that credit expansion policies such as HtB may be ineffective in tightly supply constrained and already unaffordable areas.

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We study a multi-sector model of growth with differences in TFP growth rates across sectors and derive sufficient conditions for the coexistence of structural change, characterized by sectoral labor reallocation, and constant aggregate growth path. The conditions are weak restrictions on the utility and production functions commonly applied by macroeconomists. We present evidence from US twodigit industries that is consistent with our predictions about structural change and successfully calibrate the historical shift from agriculture to manufacturing and services. We show quantitatively that reasonable deviations from our conditions do not have a big impact on the properties of the model. JEL Classification: O41, O14

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Right to Buy" (RTB), a large-scale natural experiment by which incumbent tenants in public housing could buy properties at heavily-subsidised prices, increased the homeownership rate in Britain by over 10 percentage points between 1980 and the late 1990s. This paper studies its impact on crime, showing that RTB generated significant reductions in property and violent crime that persist up to today. The gentrification of incumbent tenants and their behavioural changes were the main drivers of the crime reduction. This is evidence of a novel means by which gentrification, and housing provision, may have contributed to the sizable crime drops observed in several Western economies in the 1990s and early 2000s.

Do skill-biased shocks that increase the spread of labour productivities, interacting with different policy regimes, explain the rise in unemployment in Europe relative to the United States in the 1980s and 1990s? The hypothesis is an implication of a version of the Mortensen and Pissarides (1994) model of equilibrium unemployment which allows for worker heterogeneity. A calibrated version of the model implies that a similar unemployment increase would have occurred in the United States over this period, given changes in relative productivity by education implied by observed wage changes, had unemployment compensation and employment protection policies been at European levels.