Sorry? I can't speak for Melbourne but what is your source for food wasteage in Perth?
Why would there be? Food going out of date in restaurant freezers over the five day lockdown?
I am sure there was some but doubt that it was measureable.
In the past weeks there has been several newspaper articles from restaurateurs in both Perth and Melbourne and a high profile seafood distributor who are all destroying fresh food that can't be sold due to snap lock downs by governments.
The seafood distributor claimed it was over a million dollars worth of produce. You can't hold seafood for over a week in your fridges.
If this continues as is then it's only the beginning. There will be bankruptcies in hospitality and tourism and if the State Governments continue with the uncertainty as to what is going on, the airlines will follow as there is no demand for travel as the population has no idea if they will be allowed to leave their home. A lock down over Easter would probably be the worst possible scenario for airlines as they are claiming that travel is looking good at that time. If all that gets shut down then it could be the beginning of the end for aviation.