If there is a domain where the forecast plays a leading role, it is indeed that of the financial markets. We do not count any more the methods, the systems, the softwares, the textbooks, the reviews, the gurus, the specialists who have for ambition to predict the evolution of the stock exchange.

But for what result? With what success?

First of all it is advisable to clarify the problem.

If it was only a question of foreseeing the value of a stock-exchange security, a share, a bond, according to economic and financial criteria, we would have to resolve a simple technical problem. A possibly delicate and complicated problem but which could be resolved by means of calculation or reasoning which we know how to master. But that is not the question. It is much more complex. Why? .

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