In general, most things in Mexico cost about a third of what they would cost in North America and Europe. However, there are some exceptions to that generalization.
Some products are more expensive.
For example, paper products tend to cost more because there is very little or no pulp and paper industry in Mexico. Coconut palm trees and cactus don't process into paper very well. Food, clothing, and domestic beer, wine and liquor cost considerably less. Housing costs and rentals are also much lower.