How does the equilibrium price of a normal commodity

How does the equilibrium price of a normal commodity change when income of its buyers falls? Explain the chain of effects.

For a normal commodity, decrease in income of the buyers means decrease in its demand. Accordingly, demand curve shifts leftward and both equilibrium price and equilibrium quantity tend to decrease.

In the given diagram, actual demand curve DD and actual supply curve SS intersect at point E (i.e. equilibrium point). When income of the buyer decreases, the demand for normal good also falls and demand curve shifts leftward from DD to {{D}_{1}}
{{D}_{1}}. As a result, equilibrium price and quantity both are decreased from
OP to {{OP}_{1}} and
OQ to {{OQ}_{1}}.