But the range of rates is markedly different between the two modes.
Using this model, they discovered that when the range of rates is wide, as during fast clapping, synchronization is impossible.
Instead, there is a range of rates, any of which may exist simultaneously.
Most online hotel consolidator and discount travel sites require customers to list their destination cities, travel dates and the range of rates they are willing to pay.
When people clap fast, Dr. Barabasi said, there is a wide range of rates; when they slow down, the variability all but disappears.
US Airways' actuarial firm, Towers Perrin, submitted several calculations showing what the obligations to the pilots would be in a range of rates.
In addition, since the range of rates is vast, make sure to ask about their fees and policies.
The answer is simple: force companies to put the range of rates they offer and reveal how many applicants they accept.
But recently, various companies have taken to listing a wide range of rates for one or more of their cards and not committing to one until a credit check is made.
And there is no convincing evidence that real economic activity responds materially to changes in these rates, at least within the range of rates experienced in the United States during the last half-century.
But while studios may be willing to pay thousands of dollars a day for the preferred hairdressers of stars like Julia Roberts or Reese Witherspoon, Mr. Barrett, the New York salon owner, said salons and agencies could offer a range of rates for grooming services.
