Still, Lieber figures as long as mortgage REITs are buying on margin, some risk getting whacked eventually.

FORBES: House of Cards

Main Street investors trading for their own accounts should be especially careful about buying on margin into these lows.

FORBES: In Volatile Market, Watch Out For Margin Calls

HighTower brokers also run their own profit-and-loss statements, so instead of keeping 30% to 40% of gross fee production in W-2 earnings, they reap the benefit of all revenue associated with their clients, including interest spreads earned by lending idle cash in cash-rich accounts to other clients buying on margin.

FORBES: OutFront

That's because selling a credit swap is equivalent to buying the corporate bond on margin.

FORBES: A Dangerous Game

At the same time, he was aggressively buying Chesapeake Energy shares on margin--using borrowed money for the purchases.

FORBES: Magazine Article

Clearly, this was due to the wipe-out of speculators on margin who were not buying silver as a monetary reserve, but as a risky trade.

FORBES: Silver Down 30%, Gold Off 11% As Panic Hits Precious Metals

Consumers prefer Windows to Android on tablets by a wide margin: 46% of US consumers considering buying a tablet prefer Windows on that tablet, compared with 9% who prefer Android, according to a Forrester study conducted in January 2011.

FORBES: By Sarah Rotman Epps

On the margin, they saved it by buying the bonds that had been issued so that they could have the payroll tax cut.

FORBES: Don't Extend The Ill-Conceived, Evil Payroll Tax Cut

"At the margin, this could reduce demand, but nobody should have been buying this stuff on the basis there wasn't a material probability of at least one junk rating at some point in the future, " Mr. McNamara said of the bond sale's postponement.

WSJ: Slovenia Bond Sale Postponed

Pattern-based analytics can reveal deep insight into what customers are buying, and leverages that to offer and guide customers to the best choices based on availability and product margin.

FORBES: The Big Value In Big Data: Seeing Customer Buying Patterns