This isn't a new issue. If you have a young baby and your wife or you can't source baby formula (as has been occurring for the last year or so) you might realise that it can be a problem. There is an amount exported that does not satisfy some markets and they will endeavour to use someone else's domestic market. The big retail chains have tried to use "shopper quotas" but that is difficult on person on the checkout. They should not be "police". The Govt is still in a quandary as to how to address this problem.