revenuefixed costsprofitvariable costsaverage ostshut down pointsuffer minimum lossessuper normal profitslong run firm equilibriumnormal profitsshort run firm equilibriumnecessary conditions for firm equilibriumindustryfirmar and mr curvesperfect competitionfirm equilibriummulti system tractionac tractionindian railway systemrailway electrificationtraction motorsdc traction
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