In horizontal mergers, concentration is often measured with the Hirschmann-Herfindahl Index (HHI).  This index yields the price-cost margins in Cournot competition.  In many modern merger cases, both buyers and sellers have market power, and indeed, the buyers and sellers may be the same set of firms.  In such cases, the HHI is inapplicable.  Hendricks and McAfee develop an alternative theory that has similar data requirements as the HHI, applies to intermediate good industries with arbitrary numbers of firms on both sides, and specializes to the HHI when buyers have no market power.  The more inelastic is the downstream demand, the more captive production and consumption (not traded in the intermediate market) affects price-cost margins.  The Hendricks-McAfee Vertical Merger Simulator models this theory.