Rick Santorum and Michele Bachmann are authentic, but have been unable to distinguish themselves.

FORBES: Gingrich: Authentic Prodigal Son

Such awards are usually reduced on appeal, but the industry's chief complaint is that juries are unable to distinguish between good and bad science.

ECONOMIST: Health-care litigation costs America far too much

Its looser listing standards prompted an initial flurry of interest but have since delivered poor returns for investors unable to distinguish between hype and substance.

ECONOMIST: The JOBS Act and the BATS crash

When suppliers are unable to distinguish their goods, they begin to compete ruthlessly for market share, often by trying to undermine their rivals in the process.

FORBES: IT services are not like baseball caps

That never came to pass, partly because Nye was unable to distinguish his opposition to arms profiteering from his advocacy of isolationism, a position that had become indefensible.

NEWYORKER: The Force

He came under fire from the Lib Dem Leader Nick Clegg who accused Gordon Brown of being unable to distinguish between "good public spending and bad public spending".

BBC: The full story: PM's questions

"One minute Bale's Patrick is a cowering corporate geek and self-described empty shell, the next an arrogant, name-dropping smoothie, the next a hysterical wimp unable to distinguish reality from fantasy, " it said.

BBC: Christian Bale in The Dark Knight

In this environment, the international retailers have been unable to distinguish themselves from the local vendors where most Chinese prefer to buy the food and other items that they use on a daily basis.

FORBES: International Retailers Struggle In China