The diagram below shows a set of budget lines facing a household. 
FIGURE 6- 7
-Refer to Figure 6- 7. The movement of the budget line from ab to ac could be caused by
Definitions:
Sympathetic
Pertaining to the sympathetic nervous system, part of the autonomic nervous system responsible for activating the body's fight-or-flight response.
Somatic
Relating to or affecting the body, distinct from the mind or emotions.
Nucleus Accumbens
A brain region involved in the reward circuit, associated with pleasure, reinforcement learning, addiction, and fear.
Amygdala
A section of the brain's limbic system involved in emotion, survival instincts, and memory.
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