Using new data on security-level portfolio holdings by investor type and across countries in the euro area, we study portfolio rebalancing during the European Central Bank's (ECB) purchase programme that started in March 2015. To quantify changes in risk concentration, we estimate the evolution...

We propose a new way to construct instruments in a broad class of economic environments: "granular instrumental variables" (GIVs). In the economies we study, a few large firms, in- dustries or countries account for an important share of economic activity. As the idiosyncratic shocks from these...

The thesis of this paper is that there is no historical precedent for Europe's monetary union (EMU). While it is possible to point to similar historical experiences, the most obvious of which were in the 19th century, occurred in Europe, and had "union" as part of their names, EMU differs from...

The possibility that the euro area might break up was being raised even before the single currency existed. These scenarios were then lent new life five or six years on, when appreciation of the euro and problems of slow growth in various member states led politicians to blame the European...