En 1975 80% des mouvements financiers étaient sur le commerce mondial.
20% étaient spéculatifs.
En 1997 grâce aux ordinateurs, les mouvements financiers spéculatifs représentent 97%.
https://www.theguardian.com/commentisfree/2013/nov/20/money-trading-economy-foreign-exchange-markets-economy
According to the economist Bernard Lietaer, author of The Future of Money, as 0recently as 1975 roughly 80% of foreign exchange transactions involved the real trading of a product or a service. The remaining 20% were speculative; bets made on the value of currencies going up or down – buy it before it rises, dump it before it drops. By the late 90s that ratio had changed dramatically. In 1997 the percentage of foreign exchange which involved transactions in the real economy was only 2.5%.
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