This comment was prompted by the ABC Radio National program 'In The Public Interest' which discussed the shrinkage of products while the price remained the same. A new pricing system comes into effect in July 2009 based on 100gm weight units which hopes to help the consumer. But what about toilet rolls, which are to be charged by the sheet. Will the size be stipulated?
Some brands that used to have 700 sheets in a roll have now shrunk to 350 smaller sheets loosely wrapped around smaller cylinders, but at the same high price - enough to give us the sheets

Polly
I theek you might bee right.
The other end of the scale is the 'chocky bar option".
First your increase the size "by 20% more at the same price"..wow.Then when they print the new wrappers you find it's still 20% bigger but the price has gone up by 25% 'because of unavoidable cost in production.
Give with one hand then take more with both.
By that standard a 75 gm item will become 100 gm but the price will go up by 30+%. Watch and see.

the Any "price per measured unit" rule will address comparative price:unit measurement, where two suppliers offer comparable products in different weights/volumes.

Of course, the real issue, which is not address in this simplistic tool, is comparative value/quality.

Lets consider canned vegetables/fruit... the net content weight is not only the mass of the vegetable/fruit but also the liquid in which they are floating.

Thus a mix with is 90% vegetable / fruit and 10 % water will likely be more expensive than something which is 30% water and only 70% product.

However, it might also be better value and when the price is assessed ignoring the water content.

Of course, this measure rule will not alter or influence the product specification changes produced from "light weighting" practices which commonly occur over time.