There is a special kind of betrayal that comes with peeling back the foil on a Milka bar, only to find that the familiar purple cow has slimmed down. This week, a German court ruled that such shrinking is deceptive, and UK trading standards officers have given a quiet cheer. For those of us who grew up believing that a Milka bar was a reliable unit of comfort, this feels like a small victory in a long war. But it is also a reminder of how the cost of living crisis has crept into our most private indulgences.

Shrinkflation, the quiet theft of grams and millilitres, has become a defining trick of our times. Manufacturers argue it is a necessary evil, a way to keep prices stable when cocoa costs soar. But the German court disagreed, siding with consumer groups who argued that Milka's smaller size was a hidden price rise, a sort of tax on the unwary. The UK's own trading standards have long been wary of such practices. They have issued warnings about shrinking bags of crisps and smaller packets of biscuits. But enforcement is patchy. The German ruling gives them moral ammunition.

I stood in a supermarket aisle this morning, watching shoppers pick up and put down chocolate bars. A woman in a raincoat held a Milka against a rival brand, checking the grams. She told me she had noticed the change weeks ago. 'You feel cheated,' she said. 'But what do you do? You still want the chocolate.' That is the genius of shrinkflation. It exploits our reluctance to switch brands. It trades on habit. The German court has called that deception. But the larger question is why we tolerate it at all. Perhaps because the alternative is facing the real cost of inflation, a number that might make us put the chocolate back on the shelf.

There is a cultural shift at play here. We are becoming a nation of readers of fine print, squinting at weight labels with forensic suspicion. Trust in brands, already fragile, takes another hit. And yet, there is something almost nostalgic about this dispute. It recalls a time when consumers imagined that a chocolate bar's size was fixed, like a gram of gold. That innocence is gone. The German ruling may slow the shrink, but it will not stop it. The next time you open a Milka, you will still count the squares, and wonder if you are being had. That is the real cost: not of cocoa, but of trust.