You buy a chocolate bar in a package that claims the thing is 25% bigger than its previous version. Then you pick a shampoo that has "only natural ingredients" on the bottle and costs surprisingly little. Ooh! Now stop. Do you really get a great bargain or is it just manufacturers fooling you? Think twice — marketing experts are talented manipulators! 

For example, a bag or a bottle itself may look bigger than others produced by the same brand, but its weight can be absolutely the same! Some manufacturers aren't strangers to using optical illusions to make customers think there is more product than in reality. Empty space inside boxes, inflated plastic bags, labels stuck at the top of glass bottles so that you don't notice they are half empty... 

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