How in the 1 st stage of law of variable proportion MP is equal to AP ? This question has not been answered yet! Don't worry! You can check out similar questions with solutions below describe the three stages of law of variable proportion. ... in the second stage in law of variable proportions. ... only.Demarcate 3 stages of law of variable proportions.Explain the behaviour of MP under law of variable proportion ... the law of variable proportion withthe help of TP and MP.