In the following graph, MPC and MSC represent the marginal private cost and marginal social cost of producing a good respectively. QD represents the demand for the good. Refer to the graph to answer the question. 
The socially optimum level of output is _____ of the good.
Definitions:
Individual Resistance
Opposition or reluctance by individuals to accept change or adapt to new situations, often due to personal reasons or fear of the unknown.
Perceptions
The process of interpreting and understanding sensory information, which influences how individuals make sense of the world around them.
Personality
Personality encompasses the unique combination of emotional, attitudinal, and behavioral response patterns of an individual.
Threats to Power
Factors or situations that have the potential to diminish, challenge, or undermine an individual's or group's influence or control.
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