"Stochastic production frontiers are used for estimating regional matching functions where unemployment outflow is 'produced' by the unemployed and vacancies. The frontier is estimated using regional panel data from Finland from 1988 to 1997 and the Battese and Coelli frontier model, where the explanatory factors are included in the inefficiency term. The stochastic frontier matching function has constant returns, whereas in OLS estimation with fixed effects the returns are slightly increasing. Unemployment and vacancies in neighbouring regions have a spillover effect on efficiency. Excess job reallocation in a region deteriorates matching efficiency. The decomposition of total factor productivity change in matching to efficiency change and change in matching technology is also investigated by interpreting the matching frontier as a distance function and using Malmquist indexes. There is a downward trend in the technology, but short-term variations are dominated by cyclical changes in efficiency."

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