PepsiCo (NASDAQ: PEP ) needs to expand its margins to deliver adequate total shareholder returns. I fear that adequate growth drivers no longer exist for the company to meet the relatively high valuation it is being warrantedI hold a Master's in Accounting, am a small business owner, and am an assistant investing educator for beginning and intermediate individual investors. My investing analysis focus is on identifying and developing deep knowledge of great businesses. I have helped manage businesses, spend ...