Cost of living in Tijuana (Mexico) is 23% cheaper than in Zaragoza (Spain)
This comparison has some inconsistent or sparse data. It already provides a reliable comparison but it is not bullet-proof. It is based on 520 prices entered by 47 different people.
For example, to keep the same standard of living that would require €2,300 in Zaragoza you would need to make just about €1,777 (Mex$ 38,477) in Tijuana.