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Marco Sammon joins Ben and Dan to unpack his latest paper, ‘Index Rebalancing and Stock Market Composition’, beginning with how Marco’s work (co-written by John Shim) compares to the Nobel Prize-winner Bill Sharpe’s paper, ‘Arithmetic of Active Management.’ We investigate the missing links in Sharpe’s logic before defining “the market” and ascertaining the main objectives of index funds. Then, we dive deeper into the mechanics of Marco’s paper, index and market tracking errors, why delayed rebalancing is more beneficial than instant rebalancing, and the role of technology in the modern tracking error obsession. We also assess the passive-active spectrum of index funds in portfolio management and learn how investors should choose their optimal excess return. To end, Marco shares practical applications for improving performance benchmarked against traditional indexes, and the Aftershow is all about bridging the gap between PWL Capital and you, our listeners.
Key Points From This Episode:
(0:00:00) Key takeaways from Marco Sammon’s latest paper and how it compares to Bill Sharpe’s ‘Arithmetic of Active Management.’
(0:08:10) Marco describes what’s missing from the ‘Arithmetic of Active Management’ logic.
(0:09:11) Defining ‘the market’, the main objective of an index fund, and how index funds track the market.
(0:15:57) The mechanics of Marco’s paper, ‘Index Rebalancing and Stock Market Composition.’
(0:18:38) Factor exposure, index and market tracking errors, and how often index funds trade.
(0:26:28) Rebalancing less frequently; why delayed does better than instant rebalancing.
(0:31:59) The tech run-up and lazy rebalancing, and the modern tracking error obsession.
(0:36:51) Assessing the passive-active spectrum of index funds in portfolio management.
(0:41:02) Exploring how investors should decide on their optimal excess return.
(0:45:14) How the rising index fund ownership of stocks impacts the implicit cost of indexing
(0:46:58) Practical ways to improve performance benchmarked against traditional indexes.
(0:52:30) The Aftershow: Canadian finances, more airtime for Cameron, and PWL – OneDigital.
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Benjamin is co-host of the Rational Reminder Podcast and the host of a popular YouTube series.
Dan Bortolotti
Dan works with clients to combine investment management with long-term financial planning. He also promotes investor education through his blog, articles and podcast.
