Fast- food restaurants are very popular because the service is fast and the food is inexpensive. For many people, this is more important than the quality of the food. These restaurants are also popular because the food is always the same. People know that if they eat at a company’s restaurant in the north or south of the city, the food will be the same. If they eat in New York or London, it will still be the same.Fast service and low cost are important in the United States. One reason is that about 50 percent of all married women with children work outside the home. They are too busy and too tired to cook dinner every night.