Graph 9-7 
-According to Graph 9-7, producer surplus after trade would be:
Definitions:
Net Price
The final price after any discounts, rebates, or other deductions have been applied.
Complement Method
A technique used in mathematics and computer science to subtract one number from another by complementing one of the numbers and performing addition.
Trade Discounts
Reductions in the listed price of goods or services offered to buyers in a particular trade or industry, often provided for bulk purchases or to maintain business relationships.
Net Price
The final price after all discounts, rebates, and other reductions have been applied, excluding taxes and other fees.
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