The problem for Metro is that its prices are already about as high as it dares to go without risking an increased exodus to other stores.  When the price tag on cooked cold roast beef in the deli department is $37.40 a kilo at Metro and only $25.90 a kilo at another grocery store not far away, customers do tend to  wonder why.   Best Before dates are regularly ignored at Metro and, in some cases, on products the consumption of which after the optimum date, could be dangerous.  It shouldn’t be the customers' job to keep track of these dates – Metro must surely have computers to do this kind of work.
It's not as if Metro is offering anything spectacular in the way of ambiance or service – it’s a very ordinary store, so why, exactly, do the prices need to be so high?   If Metro dare not raise prices to claw back higher wage costs, it won't be because of the increase to the minimum wage, it will be because Metro's prices were not competitive to begin with.