Ron Stacey considers Return on Invested Capital (ROIC) and growth using EBITDA as a proxy for cash flow. ROIC, Stacey writes, is a critical value driver that’s probably the single most important factor for a given cost of capital.  But calculation is never simple: “People always want a formula, but it doesn’t work that way,” Warren Buffet once noted. “You have to estimate total cash generated from now to et ...