How is supermarket competition monitored in Australia?

Since July, Australia's competition regulator has had the power to examine the big supermarkets' books to see how much they are paying suppliers, and what they're charging customers. From there, it can assess whether a supermarket has excessive profit margins...if so, they could face a fine of up to A$10 million dollars. To explain how it's working in Australia, and what New Zealand can learn from it, Dr Meg Elkins spoke to Guyon Espiner. She's a cultural and behavioural economist, and an associate professor at Melbourne's R.M.I.T. University.