Have you ever wondered how that packet of milk biscuits you pick up every now and then remains perpetually priced at Rs.20? Or that half kilo bottle of tomato ketchup keeps going at Rs.70 for as long as it does? Don’t milk, sugar and tomato prices rise frequently? Of course they do. Commodity prices ape the mercury all the time but your biscuit-maker and ketchup-maker have been putting you on a diet without even letting you know. Scrutinise the various packs carefully and you will see irregular numbers like 142 gm or 478 gm in place of 150 gm or 500 gm. The strategy? Reduce the weight of the product but don’t raise its price. “FMCG companies have increasingly resorted to such a practice to pass on costs and still retain price perception,” says Ashish Nanda, partner-consumer products, Ernst & Young.