Every time Ann starts dating someone new, her preferences shift and she starts buying items that match the preferences of her partner. For Chris, she started buying a lot of workout equipment, for Andy it was a grunge phase, and for Tom it was purchasing a lot of unnecessary items. The demand for various items in a market can shift when consumer preferences change, and for Ann that occurs when she has a new boyfriend.
See more: demand, demand shifts, preferences, utility
Economics of Parks & Recreation 
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