Essentially, the perishables go first as they're time critical, but then they have to start making hard choices about non-perishables.
At that point, booze goes next. Mostly by triaging down to the big brewery lagers.
So (silly as it may sound) a good sign that your local supermarket is struggling with supply, for whatever reason, is ALWAYS when you start seeing empty shelves for things like Newcastle Brown Ale, bitters (that aren't John Smiths) and other Tier 2 booze.
Every time I get sent a press release for a game that promises "a realistic squad-based WW1 combat experience", I wonder how much fun getting shelled in a trench by artillery (the enemy's or sometimes your own) can really be.
"well done lads. We made it to the start line this time before we got shelled into a warm mist."
You were killed by GermanArtilleryman021221 from 2 miles away!