Also, mortgages have a duration (a calculation of the time it takes to get paid back) that is a variable, hypothetical duration that varies with prepayment speeds, so a short duration mortgage portfolio is not protection against a sudden increase in interest rates, because if interest rates rise the duration will rise which hurts the value of the bond.

FORBES: A Haven From A Eurozone Crash: Investment Grade Bonds

The Nets get a Chicago team that is wildly variable.

WSJ: Jason Gay: NYC's Playoff Double Feature

Make sure you take into account your variable costs to get to a gross profit and then fully allocate all of your fixed costs associated with that account.

FORBES: How To Raise Prices: Part 2

The unions say their case is based on years of low pay increases - highlighted, they point out, by the prime minister among others, and used as a prominent argument to get through legislation on variable tuition fees.

BBC: NEWS | UK | Education | Unions praise pay strike response

Citi Investment Research and my organization Ceres recently issued a report finding that, under the strictest mileage standard being considered, carmakers in general would increase their variable profits and the Detroit Three would get a bigger profit boost than others.

FORBES: Investors, Workers: Strong Fuel Economy Standards Will Fuel America's Economy