Numerically, this change would create proportional representation districts with an average of 10 representatives elected in each of them. Such proportional representation districts with a relatively small number of elected representatives tend to favour large parties, especially in small constituencies (which exist in Mexico, since the electoral geography is based on the federal structure); moreover, as the proposed proportional system is based on closed lists, it will enable the political parties (in fact party leadership) to have the upper hand on the selection of those candidates who have a chance to be elected. This gives parties rather than citizens more influence on who gets elected. Under such system the respect of essential democratic principles and transparency is a serious challenge and there should be some kind of external scrutiny of the respect by the political parties of the rules of internal democracy, notably during the process of selection of candidates for their electoral lists. The current provisions of the Constitution and of the electoral laws are very demanding on the selection of candidates in Mexico. The respect for the democratic principle and for transparency are guaranteed by the electoral authorities. Any changes concerning the electoral administration should guarantee the same level of protection of the right to stand for election.