Descripción: “...Based on the discussion of two recent paramount cases that involve regulatory actions of the Colombian state and property rights of foreign investors (pharmaceutical ip rights vs public health interests in the first case, consolidated mining titles vs environmental protection in the second case), we identify and criticize the difficulties of defining if a governmental regulatory action is legitimate and non-compensable or if it is subject to compensation as an indirect expropriation, and the high dependence of this matter on the interpretation of arbitral tribunals. ...”