Impact of Tastes and Preferences on Demand for a Commodity

Impact of Tastes and Preferences on Demand for a Commodity
Tastes and Preferences of the buyers are determined by three factors, 
(1) Individuals Likes and Dislikes: Individuals tend to buy more or less of a commodity simply because their likes and dislikes tend to change. 
(2) Trends and Fashions: Most individuals are influenced by the emerging trends and fashions. They simply want to be 'trendy'; accordingly, they prefer to buy more of a commodity which is the latest trend or fashion. 
(3) Climatic Environment: The tastes and preferences of consumers tend to change with change in climatic environment. Winter season induces them to goods like, tea and coffee while summer season induces them to goods like, cold drink and ice cream. 
Favourable and Unfavourable Change in Tastes and Preferences
Favourable change in tastes and preferences induces the buyers to buy more of a commodity even when it's price continues to be the same this is a situation of increase in demand, implying a forward shift in demand curve. On the other hand,  an unfavorable change in tastes and preferences causes lesser purchase of a commodity at its existing price. This is a situation of decrease in demand or backward shift in demand curve. 
The following figure illustrates both the situations. 

A favourable change in tastes and preferences causes a forward shift in demand curve from D1 to D2. 

An unfavorable change in tastes and preferences causes a backward shift in demand curve from D1 to D3. 

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