Marginal Gains (Blog)

Some thoughts I'm trying to think through more completely. Writing them down forces me to articulate my reasoning from start to finish. This is mostly just for curiosity, fun, and scratching my ever-present itch to optimize things that don't necessarily need optimizing.

2025

Pure Indexing, Flirting with Factors, and Finding Intermediaries: Thoughts on Addressing Three-Fund Portfolio Inefficiencies

44 minute read

Published:

After reading Ang’s ‘Asset Management: A Systematic Approach to Factor Investing’ and rereading the newest 50th anniversary edition of Malkiel’s ‘A Random Walk Down Wall Street,’ I wanted to explore how funds like Dimensional’s DFUS address indexing inefficiencies without fully committing to factor tilts. The goal: capture market beta with index inefficiencies such as adverse selection addressed. 5-factor regressions indicate DFUS is a VTI equivalent for US equities, but a VXUS equivalent remains unsolved. This is not financial advice and I am just your average retail investor.