This paper illustrates tacit knowledge flows between American and Canadian metropolitan areas. Using the spatial distribution of interlocking in Canada and the United States a spatial component is added to the resource dependency paradigm. Using a poisson regression model, components of cities that initiate and attract interlocking, and thus knowledge transfer, can be identified. From the results, the authors propose the concept of a "knowledge threshold" essential for the transfer of tacit knowledge. In Canada the "knowledge threshold" encompasses the entire country while it is more regionally based in the United States. [Key words: interlocking directorates, tacit knowledge transfer.]
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