The enlargement of the European Union in May 2004 triggered a relatively large and rapid migration inflow into Wales which was concentrated into narrow areas and occupations. As this inflow was larger and faster than anticipated, it arguably corresponds more closely to an exogenous supply shock...

We introduce two natural types of asymmetric single-peaked preferences, which we name biased- above and biased-below, depending on whether the asymmetry (or preference-bias) favors alternatives above or below the peak. We define a rich family of utility functions, the generalized distance-metric...