In TUrkey, Saudi Arabia and, until the 2012 reform, Mexico, TWA employment is even illegal, in the sense that the tripartite relationship - characterised by an employment contract between the worker and the agency and a commercial contract between the agency and the user firm that places the worker under the direct supervision of the user firm - is not recognised by the law and the user firm is considered, in terms of all legal implications, the employer of the worker. The Spearman rank correlation coefficient, in this case, is 0.79. Among other emerging economies, regulations are also particularly restrictive in Brazil, where the maximum duration of assignments is limited to three months, except with special government permission.