If they used to spend $300 a week on the weekly shop, then it's gone up $20 in the last year. It's hard to believe, but that's 6.4 percent inflation in food costs in the last year. It's gone up 40 bucks a week on the weekly shop just in the last four years. If they are really bad people—meaning that they use a car to get around—then they have found that the cost of filling up has gone up by around $1,700 a year if they each have a car and put in 50 litres a fortnight.