 From the time of the Conquest to the present, many , especially in rural areas, have continued to operate much in the same way as before, with only changes in merchandise that reflect changing customer needs.In the cities, especially Mexico City, the history of these markets is filled with examples of attempts to regulate them and push them away to other places, with mixed success.The Zócalo, or main plaza of Mexico City, was the scene of a number of efforts to clear the area of , street vendors, and establish permanent markets in or near the plaza such as the Parian.