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Diminishing marginal productivity implies decreasing total product.
Serotonin
A neurotransmitter involved in various functions including mood regulation, sleep, and appetite, often referred to as a "feel good" chemical in the brain.
GABA
A neurotransmitter in the brain that plays a key role in regulating nerve cell activity and inhibiting many of the signals in the central nervous system.
Acetylcholine
A neurotransmitter in the body involved in various functions including muscle contraction, arousal, and memory.
Acetylcholine
A neurotransmitter involved in many functions including muscle contraction and alertness.
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