Margin
The difference between the selling price and the purchase price of a product; margin determines the profit from the sale.
Margin determines the profitability of the goods and services you offer. Reducing margin is also a practice commonly used by salespeople during their commercial activities.
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Useful links:
https://pl.wikipedia.org/wiki/Mar%C5%BCa
https://consider.pl/marza-wszystko-co-powinienes-wiedziec/