Net weight means the weight without the wrapping. You do not pay for paper. Read all labels on all packages. Learn to compute cost per ounce to get full value for your money. Demand accurate weight and measurements in all purchases just as you demand accurate change from a cashier.
All meters start at zero, too.
Look for the seal of approval on all devices used to weigh or measure your purchase. All packages must be marked with a statement of net contents. All meat and meat products must be sold by net weight, including poultry. Don't condemn the merchant too hurriedly in case of shortweight or measure. It could be an error, an inexperienced clerk, packer, or a faulty weighing or measuring device.