Question

price floors
the line at pf represents the equilibrium price
the line at pe represents the price floor
the line between points a and b represents
excess supply
excess demand

Explanation:

Step1: Define price - floor

A price - floor is a minimum price set above the equilibrium price. Here $P_E$ is above the equilibrium price $P_F$, so $P_E$ is the price - floor.

Step2: Analyze supply and demand at price - floor

At the price - floor $P_E$, the quantity supplied ($Q_S$) is greater than the quantity demanded ($Q_D$). The difference between the quantity supplied at point B and the quantity demanded at point A is the excess supply.

Answer:

The line at $P_E$ represents the price - floor. The line between points A and B represents excess supply.