Cost of living in Shiraz (Iran) is 49% cheaper than in Arezzo (Italy)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 450 prices entered by 24 different people.
For example, to keep the same standard of living that would require €2,400 in Arezzo you would need to make just about €1,226 (﷼ 58,536,801) in Shiraz.