After the beginning of the year thundering, the financial markets are showing serious signs of nervousness. The "Vix", also known as the "fear index" because it measures the volatility on Wall Street, is regularly the subject of impressive moments. In the beginning of the year, the central banks, then engaged in a delicate exercise of tightening their monetary policy, have made a 180 degree turn. Concerns about the outlook for the global economy, they have abandoned this strategy instead to pour even more liquidity into the economy and pull the interest rates down. Euphoric, the stock markets soared.

" READ ALSO - Usa: the false debate of the independence of the Fed

But recently, the machine appears to be jammed. The Dow Jones industrial average, which had risen to nearly 27 400 points in July, decreased by a little more than 3 % during the month of August. The CAC 40, was up to nearly 5 700 points, fell to less than 5 400 points. ...