This document discusses different methods for estimating the cost of equity for Aero Pieces, an aircraft parts company, by incorporating industry risk. It compares using the Capital Asset Pricing Model with an industry risk premium, versus the traditional build-up method which factors industry risk into the company-specific risk premium. Applying each method using equity risk premium data from different sources, the estimated cost of equity for Aero Pieces ranges from 12.40% to 15.80%.