Equity Trading Through Counterparty Analysis and Edge This presents a framework for successful discretionary long/short equity trading that centers on counterparty analysis rather than abstract valuation alone. A trader must constantly ask who is on the other side of the transaction and why they are willing to trade at the current price, linking execution to a test of a trader's edge. This perspective suggests that the most profitable trades occur when one is transacting against non-fundamental, forced flows driven by factors like benchmark constraints, indexing, or risk management.