Real-world Passive vs. Active
November 14, 2016 - Big Ideas
Is a passive investor one who holds all securities in their respective market capitalization weights, or one who never trades? In his October 2016 paper entitled “Sharpening the Arithmetic of Active Management”, Lasse Pedersen challenges the proposition that active trading is a zero sum game that produces an average gross return equal to that realized by passive investors. He argues that holding the market capitalization-weighted portfolio over the long term requires trading as securities enter and exit the market, new shares are issued, old shares are repurchased and authorities reconstitute market indexes. In other words, the market portfolio changes over time such that even passive investors must trade, and they may trade unfavorably with active managers. Also, real passive investors trade for non-investment reasons, again perhaps unfavorably with active managers. Based on the arithmetic of realistic portfolio maintenance, he concludes that: Keep Reading