Will the invention of the time machine break financial markets or make them super efficient?

A thought experiment :thinking:

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  1. chaos perhaps if future can change past and hence change future too. Or if you apply 12 monkeys formula then everything is already decided and any change in past was already going to happen and doesnt change anything. In both cases we do have future uncertainty.

  2. And efficiency if only future info is available to past as then everything is known and only risk free returns for everything as there is no uncertainty. But then can past can try to change future …