Stable vs unstable equilibrium

[Asd1995]

Which of these equilibria are stable?

[Daffodils]

B

[Asd1995]

Ab samjhaa bhi do pls

[Rajesh]

i think it should be a, thinking supply curve same as MC Curve, the producer will try to maximize its surplus, which he can maximize at A..C will be stable only if: Area enclosed between supply curve and BC> Area enclosed between supply curve and AB. (not sure of the ans though)

[Asd1995]

Its B, that is confirmed.

[Algaeconomics]

Let us look at A
On the left of A Demand > SS
So prices will rise and settle with A but if something happens exogenously and we are between the point A and B supply is greater than demand so prices will fall and we will settle down at B.
Now something happens exogenously and we are between B and C here Demand is greater than supply so prices will rise and we will reach B again. So B is a stable equilibrium.
If we look at the right of point C supply is greater than dd so prices will fall and we will reach C again.
But only B is stable from both sides