Cost of living in Shiraz (Iran) is 56% 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 356 prices entered by 21 different people.
For example, to keep the same standard of living that would require €2,500 in Arezzo you would need to make just about €1,092 (﷼ 55,108,360) in Shiraz.