If A middleman is receiving either a dollar amount .The amount the retailer is receiving is known in the business as a markup.
Markup can be defined as selling price of items minus cost price of an item.
Example of the term  markup is when the cost price of a shoe is $50 in which the selling price of the shioe is $100. The difference between the cost price and selling price is what is called markup.
Therefore the amount the retailer is receiving is known in the business as a markup.
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