Currently, the legislators in the lower house of the Congress of Mexico are elected in a mixed system. Three hundred out of 500 deputies are elected by a first-past-the-post system in 300 single-member constituencies, while the remaining two hundred are elected by a proportional representation method from the party lists in five multi-state districts (electing 40 representatives each). It should be noted that mixed or combined systems of elections are usually connected with the idea of balance. In some systems single-member constituencies lead to a higher natural threshold and restrict smaller groups of society to be represented in the parliament. However, it seems that the mixed system has served Mexico well so far.