hi please be very specific so i could understand the concepts . thank you

The Price Didn't Go Up (Graded) After learning how to value a stock in his Corporate Finance class, Mark Stark decided to put his knowledge into practice and use the constant growth rate model to value EI Tomate Feliz Co. He found that the company was sevoroly undervalued. The stock was trading at $50 per share, but he valued it at \$120 per share. Mark complained thought that El Tomate Feliz was a steal and bought as many shares as I could, but the price didn't go up. I have waited a yoar, and the price has not changed that much. What could have gone wrong with Mark's valuation? What can Mark do to mitigate pitfalls in valuation