P=AR=MR\mathrm {P = AR = MR}P=AR=MR
P>AR=MR\mathrm {P > AR = MR}P>AR=MR
P=AR>MR\mathrm {P = AR > MR}P=AR>MR
P=AR<MR\mathrm {P = AR < MR}P=AR<MR