Since William Beveridge first highlighted the existence of a negative relationship between unemployment and job vacancies, the Beveridge Curve has been frequently used to sum up the state of the labour market. The efficiency at which workers are matched to available jobs is crucial for the duration of unemployment spells and the capability of the economy to make use of its resources. Due to frictions deriving from factors, such as coordination failure, heterogeneities or congestion from large numbers, the matching process is imperfect. For instance, even if there are unsatisfied vacancies...