Average price per call is the cost of a three-minute peak rate call from any country to the United States. Paved roads are roads that have been sealed with asphalt or similar road-building materials. Normalized road index is the total length of roads in a country compared with the expected length of roads, where the expectation is conditioned on population, population density, per capita income, urbanization, and regional-specific dummy variables. If the index is more than 100, the country's stock of roads exceeds the average. Goods transported by road are the volume of goods transported by road vehicles, measured in millions of metric tons times kilometers traveled.
Goods transported by rail are the tonnage of goods transported times kilometers traveled.
Aircraft departures are the number of domestic and international takeoffs of aircraft. Scientists and engineers in research and dev. Included are fundamental research, applied research, and experimental development work leading to new devices, products, or processes. Daily newspapers is the number of newspapers published at least four times a week, per 1,000 people. Radios is the estimated number of radio receivers in use for broadcasts to the general public, per 1,000 people.