According to the article from SumOfUs.org, the proposed merger would violate a court order that was part of a U.S. Department of Justice consent decree and the primary U.S. anti-trust merger statute, the Clayton Act. The merger would eliminate direct competition between two of the largest players in the farm supply and seed sector – directly affecting seed development, herbicide markets, and innovative research and development. There would likely be less choice and higher food prices for consumers.
