Figure 18-1
On the graph, L represents the quantity of labor and Q represents the quantity of output per week. 
-Refer to Figure 18-1. The marginal product of the fourth worker is
Definitions:
Optimistic Personality
A personality trait characterized by a general expectation that good things will happen or believing that the future will be favorable because one can control important outcomes.
Oxytocin
A hormone and neurotransmitter often associated with social bonding, reproduction, and childbirth.
Serotonin
Serotonin is a neurotransmitter that plays a key role in regulating mood, appetite, and sleep, among other functions.
Emotion-focused Coping
Strategies aimed at managing the emotional response to a problem, rather than tackling the problem itself.
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