Immigrants are in general younger, and our best way to fight against a growing ratio of retirees to workers.

FORBES: Does An Aging Population Hurt The Economy?

The U.S. already has a higher debt to GDP ratio than EU (17) and is growing that debt at an unsustainable 8% of GDP per annum.

FORBES: Europe's Solution Isn't More Inflation

One in three global purchases on eBay involve a mobile touch point, and the growing popularity of mobile devices as Internet access points could see the ratio go up in the coming years.

FORBES: Mobile Transactions Will Dictate How Strong eBay's Earnings Are

This ratio is 20% above the average for the sector, and growing.

FORBES: All Over the Map

PetSmart shares, which used to lean toward Target-level ( TGT) valuations, now trend closer to fast-growing companies like Chinese Internet provider Baidu ( BIDU), based in PE ratio.

FORBES: Connect

This ratio ranks higher than 60% of other such readings taken over the past year, indicating a growing appetite for puts over calls.

FORBES: Options Plays For Riding GM Lower, AutoZone Higher

Growing negative sentiment will tend to pressure stocks, so bulls need to see a roll-over in this ratio before concluding a bottom is in place.

FORBES: The Only Thing Stocks Have To Fear Is Fear Itself

With a ratio of well over 15% paying subscribers to active free users, Spotify is the largest and fastest growing service of its kind.

ENGADGET: It's here! Spotify lands in the US (video)

Yokosawa and Oberweis look for companies with accelerating earnings growth (at least 30% a year), a price-to-earnings ratio no more than twice the long-term growth rate, and a defensible competitive advantage in a growing market.

FORBES: Magazine Article