A crash course on the euro crisis∗ Markus K. Brunnermeier Ricardo Reis Princeton University LSE August 2019 Abstract The financial crises of the last twenty years brought new economic concepts into classroom discussions. This article introduces undergraduate students and teachers to seven of these models: (i) misallocation of capital inflows, (ii) modern and shadow banks, (iii) strategic complementarities and amplification, (iv) debt contracts and the distinction between solvency and liquidity, (v) the diabolic loop, (vi) regional flights to safety, and (vii) unconventional monetary policy. We apply each of them to provide a full account of the euro crisis of 2010-12. ∗Contact:
[email protected] and
[email protected]. We are grateful to Luis Garicano, Philip Lane, Sam Langfield, Marco Pagano, Tano Santos, David Thesmar, Stijn Van Nieuwerburgh, and Dimitri Vayanos for shaping our initial views on the crisis, to Kaman Lyu for excellent research assistance throughout, and to generations of students at Columbia, the LSE, and Princeton to whom we taught this material over the years, and who gave us comments on different drafts of slides and text. 1 Contents 1 Introduction3 2 Capital inflows and their allocation4 2.1 A model of misallocation..............................5 2.2 The seeds of the Euro crisis: the investment boom in Portugal........8 3 Channels of funding and the role of (shadow) banks 10 3.1 Modern and shadow banks............................ 11 3.2 The buildup towards the crisis: Spanish credit boom and the Cajas..... 13 4 The financial crash and systemic risk 16 4.1 Strategic complementarities, amplification, multiplicity, and pecuniary ex- ternalities......................................