[AngusH]

If it was really transparent maybe...

I would think that means that if the number of washing tablets went from 12 to 9, then packaging would display in prominent letters "Same price, now 9 tablets instead of 12"

Similarly for unit weights:

Chocolate biscuits, "same 12 biscuits, now 20g instead of 25g. Pack size reduced from 300g to 240g"

That would be transparency from my perspective.

[sokoloff]

“Now 20% fewer calories per biscuit!”

[AngusH]

Yes they would do that wouldn't they?

Difficult. hmmm.

I guess it would need to be a standard wording only. A specific sentence with 'fill in the blanks' only for the changed items.

"Now __ tablets instead of __"