For example, utilizing Coke-Cola the following could cause a decrease in demand.
1. People decide that they like Coke less than before maybe because they like water more.
2. There is a decrease in the number of buyers of coke.
3. Incomes fall and Coke is a normal good.
4. The price of Pepsi falls.
5. People buy less Coke because they expect the future price fo fall. Any of these factors cause a leftward shift in demand. Conversely, a decrease in quantity demanded results only from an increase in the price of coke. Why has the demand for cokes in the market fallen? What has helped market demand?