The diagram shows the demand for and supply of a normal good. ${E_1}$ is the initial equilibrium position.
Which changes could result in a new equilibrium ${E_2}$?

1 )
a decrease in both the demand for and the supply of the good
2 )
an increase in both the demand for and the supply of the good
an increase in consumer incomes, and a decrease in the supply of the good
4 )
an increase in the price of a complement to the good, and an increase in the supply of the good
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