The document discusses two housing affordability indexes - the National Association of Realtors' Housing Affordability Index (HAI) and the National Association of Home Builders' Housing Opportunity Index (HOI). Both indexes show that housing affordability is currently at or near record high levels, indicating families can more easily qualify for mortgages to buy homes. Additionally, mortgage rates remain extremely low by historical standards, enhancing affordability further. However, even small increases in rates over the life of a 30-year mortgage could end up costing homeowners thousands of extra dollars. Overall, the document argues the current environment presents a historically favorable opportunity for families to purchase homes.