By definition, investing means putting money at risk to earn an extra reward.

FORBES: The New Retirement Plan: Save More, Invest Less

There was also a feedback system, denying the encoder rat an extra reward if the decoder rat did not press the correct lever.

BBC: One rat brain 'talks' to another using electronic link

There isn't any question that directors should be compensated for their time and their work, but why the extra reward for doing what they already agreed to do--show up?

FORBES: Magazine Article

But the 30-year-old Leinster star knows that if he can inspire his country to their first Six Nations success since 1985, an extra reward could be a call to arms from McGeechan.

BBC: O'Driscoll admits Lions incentive

New investment drops and talented nationals leave for places that reward extra effort (and brains).

FORBES: Back to Work!

And, since each individual point you earn is all but worthless, it can be difficult to tell whether the reward was worth whatever extra spending you may have engaged in to secure it.

FORBES: Credit Card Tip Of The Week: Your Rewards Points Are Worthless

These range in both challenge and reward, and provide quite a bit of extra combat practice.

FORBES: 'Metal Gear Rising Revengeance' Review: Go Ahead Punk, Make My Day (PS3)

To deviate from the structure of the market portfolio was assumed to involve assuming an extra increment of risk for no matching incremental improvement in reward.

FORBES: Innovation In Investment Vehicles

He was directly involved in the development of one of the first sports reward credit card operations, which is now known as the NFL Extra Points Rewards Program.

FORBES: United MileagePlus Partnership Opens Vast Membership To Sporting And Entertainment Events