In general, they find that cross-border marriages are rising in most places, but the most significant fact is the big difference between levels in rich and developing ones.
In a seminar with an Italian colleague a few months ago, he said the big difference between you in America and us in Italy is that you can still print money.
You'd probably age more quickly so there'd be less difference between us in a few years.
It could be the difference between staying in business or going out of business.
It is possible that if they did, it would dwarf the difference between growth in high- and low-debt countries.
These sums are in essence the difference between measured changes in physical oil stocks and estimates of supply and demand.
It can also mean the difference between investing in a ship building factory in Singapore, or putting it in Seattle instead.
FORBES: A Cross Country Comparison Of Corporate Income Taxes
There's a difference between investing in research that's being done there and investing in the refurbishing of some piece of architecture there.
What is the difference between investing in the Fidelity mutual funds and investing in a 401(k) that invests in the very same Fidelity mutual funds?
FORBES: 401(k)s: Far More Dangerous Than IRAs (March 2, 2001)
The difference between rates in the overnight lending markets and rates in the longer-term markets, a gap that is widening, suggests banks aren't willing to lend much to each other.
This is what the late Journal editorial page editor Robert Bartley referred to as the difference between ethics in business and the ethics business all the way back in 1987.
"We understand the difference between investing in an asset that has value and adds value to economic activity as opposed to general spending, " said Rich Studley, president of the Michigan Chamber of Commerce.
And the actual number of transplants in the UK is up by 30% - the difference between the increase in donors and transplants is partly down to organs from some who wish to donate being unsuitable because of factors such as age and obesity.
But Mr Hague said he was "not conscious" of any difference in position between the allied countries operating in Afghanistan.
"Jens is someone at the very highest level who knows the difference in standard between mediocrity and the absolute top in the world, " says Maes.
In other words, the price difference between a chocolate bar in England and an identical bar in the United States may not be completely arbitraged away by the importation of U.S. chocolate bars because there is still the matter of transportation costs.
Ms Griffiths also dismissed a suggestion from Conservative AM Darren Millar that the difference in waiting times between south and north Wales could be down to a difference in funding.
The actor Morgan Freeman and the comedian Bill Maher have each given a million dollars to Priorities USA. The difference in temperament between Clinton and Obama is felt particularly keenly in Hollywood, however.
's Nicholas Negroponte describes the difference between physical products and information products in the digital age as the difference between moving atoms around (physical products such as cars and computers) and moving bits around (electronic products such as financial analyses and news broadcasts).
But the most scientifically credible study of the effects of Medicaid, based on randomly assigning 10, 000 people to Medicaid coverage in Oregon, found there was no statistically significant difference in ER use between those newly enrolled in Medicaid relative to the (largely uninsured) comparison group.
FORBES: States Face a "Sophie's Choice" on Medicaid Expansion
"Anyone driving will appreciate the difference in traffic between the holidays and term time - and schools in Hebden Bridge have real parking problems, " says road safety officer, Peter Shepherdson.
Is there a difference between the two in terms of ultimate negative effects on the economy.
FORBES: Fed Levitating Bond Prices Same Way Zero Percent Down Levitated Home Prices
For example, PIXE can tell the difference between copper mined in the U.S. from copper mined in Britain.
There is, however, a 2%-a-year difference between the rise in the working population of America and the fall in Japan.
The difference between these tracks in both mood and pattern demonstrates that Black Milk is an artist with range and staying power.
The population control accounts for the big difference between the increase in employment of 117, 000 and the decline in unemployment of 622, 000.
In the press conference that followed his introduction to Real's fans, he predicted he would notice a difference between playing styles in the two countries.
The difference between you being in the path of this twister and a few blocks away, you being okay, is a very slim, slim margin.
She's no novice, but there's a long road of difference between getting snagged in an unguarded moment and standing at a podium or sitting for an interview.
"I've seen this before from other university research groups and there is a world of difference between nice results in the lab and commercially viable products, " Leggett said.
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