I’ll summarise my understanding here:
In order to have a completely diversified portfolio under the “completion portfolio” method
– the low basis stock will slowly be liquidated
– as liquidation will result in tax consequences, other assets will be necessary to offset the high profits – essentially, you’ll have to offset tax effects
– liquidation will take time to achieve, so its slow
– not sure whether it’s actively managed – the low basis is liquidated for a diversified
portfolio, so don’t think its “actively managed” in the sense that the completion will have unsystematic risk exposures
– you don’t need other people for the same stock, that arises in a private exchange fund if I remember correctly