Cost of living in Arequipa (Peru) is 56% cheaper than in Aalborg (Denmark)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 184 prices entered by 11 different people.
For example, to keep the same standard of living that would require kr25,000 in Aalborg you would need to make just about kr11,073 (S/. 5,644) in Arequipa.