While the income tax is in a slump right now, it is traditionally the fastest-growing source of revenue for the city.

The electronics industry, formerly one of the nation's fastest-growing sources of employment, is now emerging from a slump that has lasted two years.

The biggest and fastest-growing source of wealth in the area, however, is farming coca.

The nonprofit sector is the fastest-growing source of jobs in New York City, according to a new study of the sector's economic role.

In fact, ground beef isn't the fastest-growing source of E. coli.

IN recent years, wind and solar power have been among the fastest-growing sources of energy in the country.

Though advertising on Web sites accounts for only 2 to 3 percent of the revenues of most newspapers, it is the fastest-growing source of revenue.

Now, live video streaming is mlb.com's fastest-growing source of revenue.

Both companies said advertising represented their fastest-growing source of revenue.

Transport is the fastest-growing source of global warming gases in Europe.