The cost of raising a child varies from country to country. The cost of raising a child is usually determined according to a formula that accounts for major areas of expenditure, such as food, housing, and clothing. However, any given family's actual expenses may differ from the estimates. For example, the rent on a home does not usually change when the tenants have another child, so the family's housing costs may remain the same. In other cases, the home may be too small, in which case the family might move to a larger home at a higher cost. The formula may also account for inflation, as prices are constantly changing, and it will inadvertently effect how much it costs to raise a child.