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Solving non‐routine problems—problems for which current organizational, recurrent action patterns do not offer a predetermined, effective solution—can be an important source of value creation. When these problems occur in subsidiaries of multinational corporations, senior headquarters managers can potentially help solve them. However, whether their involvement is beneficial rests upon the assumptions that they know which knowledge is appropriate and that their involvement does not negatively influence the problem solving process. We challenge these assumptions and theorize that the involvement of senior headquarters managers is negatively related to solution effectiveness, unless senior subsidiary managers are also involved, and especially if problems have an external locus (i.e., primarily relate to the firm's products and services). Our robust results are consistent with our theory …