The diagram shows an increase in the demand for a good from ${D_1}$ to ${D_2}$.
What effect does the change in demand have on producer surplus?

1 )
decrease by ${P_1}YW{P_2}$
2 )
decrease by ${P_2}VY{P_1}$
increase by ${P_1}YW{P_2}$
4 )
increase by ${P_2}VY{P_1}$
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