The diagram shows the demand curve, $D{D_1}$, and the supply curve, $S{S_1}$, for eye operations.
The operations are provided free to the consumer.
Which statement is correct?
1 )
Consumer surplus from the operations is $OD{D_1}$.
The equilibrium price is P.
3 )
The equilibrium price is indeterminate, because the supply curve is vertical.
4 )
The equilibrium price is zero.
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