${D_1}$ and S1 are the initial demand and supply curves for a normal product. They then change to ${D_2}$ and ${S_2}$.
Which pair of changes would result in the market equilibrium for the product changing from ${X_1}$ to ${X_2}$?
a fall in the price of a raw material used in the manufacturing and a decrease in the price of a complementary good
2 )
an increase in average consumer incomes and an increase in the level of an indirect tax imposed
3 )
an increase in the price elasticity of demand for the product and a fall in its price elasticity of supply
4 )
a rise in the population and an increase in the price of labour used in manufacturing
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