![Stumped for gift ideas? You can use maths to maximise your Christmas haul, according to a new book.](/web/20161204152440im_/http://www.smh.com.au/content/dam/images/g/s/g/a/1/w/image.related.landscape.460x307.gt2vva.png/1480854389778.jpg)
How to exploit ‘game theory’ to stuff your stocking this Christmas
Only my closest friends know my darkest secret. I'm a Kmart shopaholic. I've never met a rose gold photo frame or marble cheese board I didn't want to own. And at $2 a pop? I'll take three.