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STICK IT OUT OR EVEN IT OUT? Towards a robust multi-period efficient frontier HISTORY OF PORTFOLIO SELECTION 1952, Markowitz: Efficient frontier for one-off investments 1956, Kelly: Optimize expected terminal wealth for repeated games 1991,


  1. STICK IT OUT OR EVEN IT OUT? Towards a robust multi-period efficient frontier

  2. HISTORY OF PORTFOLIO SELECTION 1952, Markowitz: Efficient frontier for one-off investments 1956, Kelly: Optimize expected terminal wealth for repeated games 1991, Cover: Kelly without statistical assumptions

  3. MODERN PORTFOLIO THEORY Portfolio should be risk/return Pareto efficient Does not use intermediate info Return Risk

  4. ONLINE PORTFOLIO SELECTION Investing is a repeated game Kelly: if distribution known, calculate terminal wealth optimizer Cover: no assumptions, compare with a good benchmark

  5. THE MAIN IDEA No statistical assumptions Define a 'best strategy in hindsight' a la Markowitz Minimize maximum distance to best strategy Repeat for different risk preferences to build efficient frontier

  6. Why no statistical assumptions? Assets get (de)listed Trump starts a tariff war

  7. Why that arbitrary benchmark? 14 Cover 13 12 11 1/N 10 BCRP: >60 9 8 7 SP500 6 5 4 3 2 1 0 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018

  8. NEXT STEPS Find efficient frontier Include transaction costs Optimal rebalancing frequency Theorems, proofs

  9. Slides available at sebastiaanvermeulen.nl/slides/online-portfolios Slides created with reveal.js.

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