“the lesson of experience is that there is no single approach to financial markets which makes money or explains ‘what is going on here’, no single narrative of ‘the financial world as it really is’. There is a multiplicity of valid approaches, and the appropriate tools, model-based or narrative, are specific to context and to the skills and judgement of the investor. We can indeed benefit from the insights of both Thales of Miletus and Harry Markowitz, and learn from both of the contradictory narratives of the world of finance propagated by Gene Fama and Bob Shiller. But we must also recognise the limits to the insights we derive from their small-world models....Radical uncertainty precludes optimising behaviour. In the world as it is, we cope rather than optimise.”
Trechos retirados de “Radical Uncertainty” de John Kay e Mervyn King
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