OBS_VALUE: <ul><li><a href=https://leyes-mx.com/constitucion.htm target=_blank>Mexican Constitution(Constitución Política de los Estados Unidos Mexicanos, 5 February 1917, last amended on 28 May 2021, Article 28)</a></li><li><a href=https://www.diputados.gob.mx/LeyesBiblio/ref/lfce.htm target=_blank>Federal Law on Economic Competition(Ley Federal de Competencia Económica, 23 May 2014, last amended on 20 May 2021, Article 9)</a></li><li><a href=https://www.scribd.com/document/369553359/Decreto-338-Reglamento-de-Precios-de-Derivados-de-Petroleo target=_blank>Executive Decree 338, Regulation of the prices of oil derivatives(Reglamento de regulacion de precios de derivados de petroleo, Decreto Ejecutivo 338, 02 August 2005, last amended on 25 April 2019.)</a></li></ul>