Sourcing from the Enemy: Horizontal Subcontracting in Highway Procurement

Abstract

I empirically consider the effect of horizontal subcontracting on firm bidding strategies in California highway construction auctions. Subcontractors are hired by prime contractors prior to the auction, and the subcontractor may also be a competitor in the primary auction. While horizontal subcontracting may improve productive efficiency, it softens the horizontal subcontractor's bid strategy, since winning the auction may entail losing subcontracting business. I find that while each additional competitor supplied by the firm is estimated to increase its bid by 1.4 per cent, the winning bid is uncorrelated with horizontal subcontracting. This points toward an efficiency motive for cross‐supply.

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