That lesson has come through time and again via industry studies, including one from Barra.
Third party, non-industry studies show that job boards are the second highest source of hires for employers.
Other industry studies have broadly agreed with the thesis that new products do more to drive sales and gain incremental share than any other factor, by far.
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And as profitable as strategic acquisitions can potentially be, various industry studies have shown that about 90% of sales come from customers who have bought your product before.
On the other hand, industry funded studies showed a smaller association but greater precision.
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That kind of arithmetic points to a strong bias, at the very least, in industry-linked studies.
The German insurance industry funded many studies on acupuncture and their conclusion was that acupuncture should be covered for several medical conditions.
Industry-funded studies said the rule would cost millions of jobs.
The Asphalt Industry Alliance has conducted studies on pothole formations and has worked with local authorities on the issue.
The two largest providers offshore may each have 10% of the global market, estimates Jason Sharman, an Australian professor who studies the industry.
International Data Corp, which also studies the industry, has lowered its forecast for worldwide PC sales this year from a 0.2% decline on the previous year to a massive 9.6% drop.
While the ESMAP paper cited above suggests annual cost declines of 7% for gas turbine technologies, case studies from industry suggest a rate of cost decline at least double the ESMAP figure.
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This article, published in the Christmas 2012 issue of the British Medical Journal, reviewed industry reports and medical studies to help guide physicians who may have to answer questions and fill out fitness to fly certificates for the growing ranks of aspiring space travelers.
Two studies funded by industry and vetted by the FDA found that the therapy was modestly beneficial.
The future offers the industry little comfort, with studies showing newspapers have lost a generation of young readers.
According to NPD, a global information company that studies the restaurant industry, overall sales were flat in 2012.
For the first time researchers at Children's Hospital in Boston have documented widespread bias in nutrition studies funded with industry money.
Tom Rodenhauser of Kennedy Information, which studies the consulting industry, agrees that it has yet to make a breakthrough in high-end work.
In a statement to the BBC, Exxon Mobil said that before drilling offshore "it is standard industry practice to conduct extensive studies at and below the seabed" to check for hazards, using tools including remote sonar and a magnetometer.
So it's no surprise that industry-affiliated groups commissioned two studies to examine the effect of business travel expenditures on corporate profits.
The researchers called for new rules to ensure their is better access to studies done by the pharmaceutical industry.
Well, the tea industry has not been shy about promoting studies contending that tea provides remedies for a broad spectrum of what ails you.
Studies and analysis of the industry are practically non-existent.
"This is an industry where if you get your costs out of line and business is not so good, you're dead, " says Sam Peltzman, a University of Chicago business school economics professor who studies labor and the airline industry.
"This is an industry where if you get your costs out of line and business is not so good, you're dead, " says Sam Peltzman, an economics professor at the University of Chicago business school who studies labor and the airline industry.
"The device industry would grind to a halt" if studies for implants became as big as those for drugs, says Mitchell Krucoff of the Duke Clinical Research Institute.
"There's no question that China is very sensitive to its image, " said Stanley Rosen, an expert on the Chinese film industry, and director of the East Asian Studies Center at the University of Southern California in Los Angeles.
Eliminating phase 3 studies would erode the attempts that the industry is making to restore its image.
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The first studies, conducted principally by the nuclear industry and its proponents in both countries, improbably suggested that alternative fuels would be too costly.
In our conversation, Shiller argued that these sorts of studies have tainted the reputation of an industry that, on the whole, is a positive force in the world.
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