The Q-Theory of Mergers

Working Paper: NBER ID: w8740

Authors: Boyan Jovanovic; Peter L. Rousseau

Abstract: The Q-theory of investment says that a firm's investment rate should rise with its Q. We argue here that this theory also explains why some firms buy other firms. We find that 1. A firm's merger and acquisition (M&A) investment responds to its Q more -- by a factor of 2.6 -- than its direct investment does, probably because M&A investment is a high fixed cost and a low marginal adjustment cost activity, 2. The typical firm wastes some cash on M&As, but not on internal investment, i.e., the 'Free-Cash Flow' story works, but explains a small fraction of mergers only, and 3. The merger waves of 1900 and the 1920's, `80s, and `90s were a response to profitable reallocation opportunities, but the `60s wave was probably caused by something else.

Keywords: No keywords provided

JEL Codes: O3


Causal Claims Network Graph

Edges that are evidenced by causal inference methods are in orange, and the rest are in light blue.


Causal Claims

CauseEffect
firm's q (D25)M&A investment (G34)
firm's q (D25)direct investment (F21)
M&A investment (G34)cash wastage (D61)
merger waves (F12)profitable reallocation opportunities (D61)

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