In Kolkata, sweet sellers was struggling with cost management after covid due to increased prices of raw materials. But they couldn't increase the price any further without losing customers. So they reduced the size of sweets instead, and market slowly reduced expectations. And this is the new normal now.

Human psychology is surprisingly similar, and same pattern comes across domains.

It's not just in Kolkata, worldwide packs of biscuits etc remained the same size but less inside.

I didn't buy Springles chips in years, even the box now is nothing like it was. Thinner. Shorter. I imagine how far from the top the slices stack up.

See also: Shrinkflation (https://en.wikipedia.org/wiki/Shrinkflation)