Measures of poverty have traditionally been based on income or consumption, and many official measures of poverty, particularly in developing countries, are still centered on these figures. To calculate food consumption, a standard measure is specified, typically in terms of a “basket” of basic nutritional necessities. The estimated monetary income required to purchase the basket then sets the food poverty line. To calculate the overall poverty line, non-food goods and services such as shelter, health care and clothing are added to the food calculations. Additionally, surveys of living standards gauge consumption based on ownership of items such as a bicycle or refrigerator, and include questions about the materials used to construct the home.