A hundred pounds is a lot more to someone who's poor than to a millionaire. But how do you measure such differences? Utility theory has the answer.

How "forced experimentation" can lead to economic benefits.

Well, it goes to no-one because there isn't a Nobel Prize for maths. Some have speculated that Alfred Nobel neglected maths because his wife ran off with a mathematician, but the rumour seems to be unfounded. But whatever the reason for its non-appearance in the Nobel list, it's maths that makes the science-based Nobel subjects possible and it usually plays a fundamental role in the some of the laureates' work. Here we'll have a look at two of the prizes awarded this year, in physics and economics.

The 2009 Nobel Prize in Economics goes to two unusual economists
Game theorists model the evolution of trust and trustworthiness
Ground breaking work in uncovering optimal funding mechanisms in financial markets
Economists reveal that your neighbours significantly impact on your well-being.
From Einstein to water power, Plus author Anita King explains where maths has got her.
There might not be a Nobel Prize for mathematics, but maths is at the heart of the 2006 Nobel Prizes.
In the last article of this three-part series, Phil Wilson shows how simple graphs can tell you a lot about the economy — and not only in Slugworld.
The risks in Who wants to be a millionaire?
Riaz Ahmad's mathematical career has led him from the complexities of blood flow to the risks of the financial markets via underwater acoustics. Plus found out how maths can explain all this and more.
  • Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.