This document discusses macro issues in valuation for mergers and acquisitions. It begins by defining valuation as determining the economic worth of an asset or company based on certain assumptions. It then discusses key valuation approaches such as income, market, and asset approaches. It also discusses factors that can cause valuations in M&A to depart from fair value, such as control premiums and synergies. Finally, it provides a case study showing how to calculate an exchange ratio in a merger between a listed steel company and unlisted power company based on valuations of both companies.