The Regional Price Parity (RPP) index is a measure of the national average of the cost of goods and services. The national average is set to 100 and allows for regions across the country to be compared in order to determine how much more or less expensive a given region is compared to the average, Business Insider reports.
For example, a region with a RPP of 110 means it is 10 percent more expensive than the national average. Conversely, an RPP of 90 means the area is 10 percent less expensive than the national average.
According to this measurement, Urban Honolulu, Hawaii is the most expensive metro in the country with an RPP of 123.5. San Jose-Sunnyvale-Santa Clara, Calif. (122.9), New York-Newark-Jersey City, N.Y.-N.J.-Pa. (122.3), and Santa Cruz-Watsonville, Calif. (121.8) follow Urban Honolulu.
Beckley, W.Va., is the least expensive metro with an RPP of 79.7. Rome, Ga. (80.7), Danville, Ill. (81.1), and Morristown, Tenn. (81.9) round out the top five least expensive metros.
For the complete lists of the most and least expensive metros in the country, click the link below.