Classical Ergodicity and Modern Portfolio Theory

Geoffrey Poitras and John Heaney

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Abstract: What role have theoretical methods initially developed in mathematics and physics played in the progress of financial economics? What is the relationship between financial economics and econophysics? What is the relevance of the "classical ergodicity hypothesis" to modern portfolio theory? This paper addresses these questions by reviewing the etymology and history of the classical ergodicity hypothesis in 19th century statistical mechanics. An explanation of classical ergodicity is provided that establishes a connection to the fundamental empirical problem of using nonexperimental data to verify theoretical propositions in modern portfolio theory. The role of the ergodicity assumption in the ex post/ex ante quandary confronting modern portfolio theory is also examined.

Date: 2015-08-02
Note: View the original document on HAL open archive server: https://hal.science/hal-03680380
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Published in Chinese Journal of Mathematics, 2015, 2015, pp.1-17. ⟨10.1155/2015/737905⟩

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Working Paper: Classical Ergodicity and Modern Portfolio Theory (2015)
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Persistent link: https://EconPapers.repec.org/RePEc:hal:journl:hal-03680380

DOI: 10.1155/2015/737905

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