Indeed, Mr Deighton believes that the television commercial will remain the mainstay of the advertising industry for years to come.

ECONOMIST: The recession in advertising

That is because natural-gas exports, long the mainstay of the energy industry, are threatened by shale gas in the United States (they have fallen by 5% over the past year).

ECONOMIST: Energy in Canada

Despite the years of decline, the cocoa industry is still the mainstay of Ghana's economy.

CNN: Ghana cocoa industry at crossroads

The with-profits policy, a mainstay of the life-insurance industry, is especially opaque, says the review.

ECONOMIST: Saving

These treatments became a mainstay of the nascent biotechnology industry, which started with the founding of Genentech in 1976.

FORBES: How The Odd Couple's Jack Klugman Helped Create The Biotech Industry

That kind of premium business is what a mainstay of the old printing industry--Heidelberger Druckmaschinen, a low-profile, 152-year-old German press manufacturer--is after.

FORBES: Hot type

Visitors from Japan are the mainstay of Guam's tourist industry.

BBC: Knifeman kills two in Guam attack

The tourism industry, the mainstay of the economy in many of the small Eastern Caribbean Islands, is still very much beach orientated.

UNESCO: Introduction