When their demands were not met they would feel uncomfortable even feel miserable and unfortunate. Humans will be settled according to two different solutions. First, seek to address the needs for example: A child is hungry, and add the milk, then the child is in need of milk, and the child is going to find ways to make milk to satisfy themselves. Finally, the reduction in the current rate of demand eg in case the child can not afford to pay, so it will try to curb itself.
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