Yucatan Living has a great article about the cost of living in Merida. Living in Merida is cheaper than living in
Playa del Carmen, but this gives a great overview of things. The prices for food appear to be the similar, whereas the cost for rent is much different. It's definitely a good starting point for people curious about the subject of the cost of living here.
Yucatan Living - The Cost of Living in Merida Yucatan