Conversation so far:
What were the special economic zones?
At the end of May 2016, Pena Nieto signed a law that will create special economic zones in economically underdeveloped southern states.
Why did he create the zones?
The special economic zones are meant to alleviate the lack of industry in the South.
What states were these zones in?
The first three are: Lazaro Cardenas, Michoacan; Port Chiapas, Chiapas; and in the Isthmus of Tehuantepec.
What are the others?
Another zone in the petroleum region of Tabasco and Campeche, hit by the downturn in the oil industry, is planned for 2017.
Did he give any other reasons for the zones?
The special economic zones are meant to alleviate the lack of industry in the South.

Question: What do the special economic zones do?
Self-contained rewrite: What do Enrique Peña Nieto's special economic zones do?