The most likely cause when equilibrium price and the equilibrium quantity both rise will be seen as increased in demand but no changes in the supply will be observed.
Demand will be refers as desires and ability of consumers to purchase any product. If the demand for a particular product rise then the prices will also become high.
When the demand and supply are measured as balanced in economy it represent market equilibrium.
When the prices and quantity both rose in equilibrium then in this case demand will be high but supply remain constant.
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