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An index where the influence of components of the index is limited to a specific percentage of the total. For example, the JSE Top 40 index has a 10% "cap" which means that no single share in that index has more than a 10% impact on the total index. If this were not the case, Naspers, which is more than twice as large as any other share in the index, would dominate with over 23%. The next two largest shares in that index are Richmont and BHP, both of which account for just over 8% of the index.