Today, I'm going to make a speech, giving you a few elements since I'm not the only one predicting an upcoming crash.
The upward revisions of European growth should not hide uncertainties. In case of crash, public authorities (governments and central banks) have already played their last cards. Economist Marc Touati predicted that The world economy is going to collapse.

For now, all is well! Everything's even better, according to some. And for good reason: according to the IMF, the ECB and many economic research institutes, the European Commission raised its growth forecasts for the euro-zone and for France in 2015. Beautiful!
But then, as we have often shown, consensus is very often wrong. That’s when everyone thinks the same thing that we should begin to worry. And that, especially when the forecasts of the IMF, the ECB and the European Commission are converging. It would be useful, for example, to recall that in 2007 and early 2008, these three institutions stressed that Euroland's economy was doing wonders and provided steady growth for 2008-2009, accompanied by high inflation. This is also partly because of this announced dynamism that the ECB raised its key interest rates in late 2007 and until July 2008. Better, in most of its reports since 2006, the European Commission and the IMF kept praising the economic success of Spain, Portugal and Greece!
Obviously, it would be difficult to do worse. That is what happened when in 2011 these institutions announced the strong upturn in growth in the euro area, the ECB even matching words with action by increasing twice its refi rate. If the past is dead and does not serve much of rubbing salt in a still open wound, these forecast errors nonetheless recall that the newest results of the IMF, the ECB and the European Commission must be taken very carefully.
The latest survey data, including purchasing managers’ indexes, the IFO institute, INSEE, but also the European Commission, are also clear: business outlook is already down. Consequently, After good growth through the first quarters, a marked slowdown or even a decline of the GDP is expected to occur in the euro area and in particular in France in the second quarter.
But that's not all, because if investors and the economic and financial world as a whole are accustomed to economic weakness in the euro area, they are frightened by the looming slowdown in the US and China. In this context, and as has already begun for ten days, financial markets could experience multiple storms, preceding a crash that would break out by next fall.