Use the following to answer question:
Figure: Monopoly Profits in Duopoly 
-(Figure: Monopoly Profits in Duopoly) Use Figure: Monopoly Profits in Duopoly.The figure shows how an industry consisting of two firms that face identical demand curves (D1) can collude to increase profits.The market demand curve is D2. Which assumption is part of the analysis illustrated by the model?
Definitions:
Martyrdom of Saint Serapion
A Baroque painting by Francisco de Zurbarán, depicting the martyrdom of Saint Serapion, a member of the Mercedarian order, known for its stark realism and emotional depth.
Naturalism
An artistic or philosophical perspective that aims to represent subjects accurately and realistically based on observable phenomena.
José de Ribera
A Spanish Tenebrist painter and printmaker, noted for his dramatic lighting and intense realism.
New Spain
The name for the territory that was under Spanish rule in the Americas from the 16th to the 19th century, including modern-day Mexico, Central America, and parts of the United States.
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