Myck, Michał; Najsztub, Mateusz - 2019
district in Poland. For this purpose, we take advantage of a major administrative re-form, implemented on 1 January 1999, which … 16. We treat the reform as a natural experiment, and apply the difference-in-differences approach to study developments … overall post-reform difference in the length of the total water pipe network is 25% and the difference in the per …