When a surplus of product is evident in an otherwise perfectly competitive market, one likely cause of this is:

Question $6$ options:

a$)$

a price ceiling set at a price above equilibrium

b$)$

a price ceiling set at a price below equilibrium

c$)$

a quota set at a quantity above equilibrium

d$)$

a quota set at a quantity below equilibrium

e$)$

a price floor set at a price above equilibrium

f$)$

a price floor set at a price below equilibrium