The research conducted by [behavioral scientist Patrick] Laughlin and his colleagues tells us why the best leader operating individually will be beaten to a correct solution by an all-inclusive cooperating unit. First, lone decision-makers can’t match the diversity of knowledge and perspectives of a multi-person unit that includes them. The input from others can stimulate thinking processes that wouldn’t have been developed when working alone. … Second, the solution seeker who goes it alone loses another significant advantage–the power of parallel processing. Whereas a cooperating unit can distribute many subtasks of a problem to its members, a lone operator must perform each task sequentially. (Goldstein, Martin, and Cialdini 100).
Goldstein, Noah J., Steve J. Martin, and Robert B. Cialdini. Yes! 50 Scientifically Proven Ways to Be Persuasive. Simon & Schuster, 2008.