The second major criticism of inflation measures is that they exclude items of crucial importance to people's lives, notably asset prices — and house prices, in particular. The CPI does include rents, and some versions of it also include 'imputed rents,' which are the estimated rents that those who own their own properties (with or without a mortgage) aren't paying. But house prices aren't included because a house is considered an asset, not a good. However, many people, particularly those who are struggling to buy a house, argue that house prices should be included in official inflation measures.