Current research offers alternative explanations to the "linkage" between t
he pattern of diversification and performance. At least four streams of res
earch can be identified. None of these can be considered to be a reliable,
predictive theory of successful diversification. They are, at best, partial
explanations. The purpose of this paper is to propose an additional "linka
ge," conceptual at this stage, that might help our understanding of the cru
cial connection between diversity and performance. The conceptual argument
is intended as a "supplement" to the current lines of research, rather than
as an alternative explanation.