In the current market session, Merck & Co Inc. MRK price is at $81.57, after a 0.07% spike. However, over the past month, the stock decreased by 4.02%, and in the past year, by 29.04%. Shareholders might be interested in knowing whether the stock is undervalued, even if the company is performing up to par in the current session. Evaluating Merck & Co P/E in Comparison to Its PeersThe P/E ratio measures the current share price to the company's EPS. It is used by long-term investors to analyze the company's c ...