Use the following to answer question:
Figure: Firms in Monopolistic Competition 
-(Figure: Firms in Monopolistic Competition) Use Figure: Firms in Monopolistic Competition.In panel (A) of the figure,the profit-maximizing quantity of output is determined by the intersection at point:
Definitions:
PTSD
A mental health issue known as Post-Traumatic Stress Disorder arises from either undergoing or observing a horrifying incident.
Genetic Basis
The role of genes and genetic variation in determining physical and behavioral traits in organisms.
OCD
Obsessive-Compulsive Disorder, a mental health disorder characterized by unwanted recurring thoughts (obsessions) and repetitive behaviors (compulsions).
Twin Studies
Research that compares the similarity between monozygotic (identical) twins and dizygotic (fraternal) twins to understand the role of genetics vs. environment in human development.
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