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The Diablo 3 Economy: An Agent Based Approach

Makram El-Shagi, Gregor von Schweinitz
Computational Economics, Nr. 2, 2016
Abstract
Designers of MMOs such as Diablo 3 face economic problems much like policy makers in the real world, e.g. inflation and distributional issues. Solving economic problems through regular updates (patches) became as important to those games as traditional gameplay issues. In this paper we provide an agent framework inspired by the economic features of Diablo 3 and analyze the effect of monetary policy in the game. Our model reproduces a number of features known from the Diablo 3 economy such as a heterogeneous price development, driven almost exclusively by goods of high quality, a highly unequal wealth distribution and strongly decreasing economic mobility. The basic framework presented in this paper is meant as a stepping stone to further research, where our evidence is used to deepen our understanding of the real-world counterparts of such problems. The advantage of our model is that it combines simplicity that is inherent to model economies with a similarly simple observable counterpart (namely the game environment where real agents interact). By matching the dynamics of the game economy we can thus easily verify that our behavioral assumptions are good approximations to reality.
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The Effect of Personal Bankruptcy Exemptions on Investment in Home Equity

S. Corradin, Reint E. Gropp, H. Huizinga, Luc Laeven
Journal of Financial Intermediation, January 2016
Abstract
Homestead exemptions to personal bankruptcy allow households to retain their home equity up to a limit determined at the state level. Households that may experience bankruptcy thus have an incentive to bias their portfolios towards home equity. Using US household data for the period 1996 to 2006, we find that household demand for real estate is relatively high if the marginal investment in home equity is covered by the exemption. The home equity bias is more pronounced for younger and less healthy households that face more financial uncertainty and therefore have a higher ex ante probability of bankruptcy. These results suggest that homestead exemptions have an important bearing on the portfolio allocation of US households and the extent to which they insure against bad shocks.
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Monetary Policy under the Microscope: Intra-bank Transmission of Asset Purchase Programs of the ECB

L. Cycon, Michael Koetter
IWH Discussion Papers, Nr. 9, 2015
Abstract
With a unique loan portfolio maintained by a top-20 universal bank in Germany, this study tests whether unconventional monetary policy by the European Central Bank (ECB) reduced corporate borrowing costs. We decompose corporate lending rates into refinancing costs, as determined by money markets, and markups that the bank is able to charge its customers in regional markets. This decomposition reveals how banks transmit monetary policy within their organizations. To identify policy effects on loan rate components, we exploit the co-existence of eurozone-wide security purchase programs and regional fiscal policies at the district level. ECB purchase programs reduced refinancing costs significantly, even in an economy not specifically targeted for sovereign debt stress relief, but not loan rates themselves. However, asset purchases mitigated those loan price hikes due to additional credit demand stimulated by regional tax policy and enabled the bank to realize larger economic margins.
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EFN Report Spring 2015: Economic Outlook for the Euro Area in 2015 and 2016

EFN Reports, Nr. 2, 2015
Abstract
Recent movements on world markets for commodities, currencies and capital stimulate the world economy, but they entail also considerable risks: income losses of energy exporting countries might trigger financial crises with worldwide repercussions; crises might also emerge from financial distress of emerging market debtors with liabilities denominated in US dollars. Extremely low interest rates might not only trigger stock and bond price booms, but also more volatility if investors become fearful of financial bubbles. Quite a few conditions are highly beneficial for a recovery of the euro area economy: governments and large corporations benefit from ultra-low bond yields, banks’ composite costs of debt financing have been converging during the past two years to very low levels, and borrowing costs for non-financial corporations have come down markedly. Prices for stocks, bonds and (on average) houses have gone up. Real disposable incomes of private households have risen due to oil prices. The real effective exchange rate is about 10% lower in March 2015 than it was a year ago, strengthening the price competitiveness of firms in the euro area. According to our forecasts, the euro area GDP will grow by 1.6% in 2015 and by 2.1% in 2016. Structural impediments, however, still limit the ability of the euro area economy to grow strongly: firms and, in particular, private households are only slowly reducing their heavy debt burdens, and confidence will not fully come back in France and Italy, as long as reform processes are inconclusive in both countries and as long as unemployment is not coming down markedly. Our inflation forecast for 2015 is 0.1%, with the possibility of a mild deflation not excluded. In 2016 inflation will increase up to 1.3%, still clearly below the 2% ECB’s target. This calls for continued monetary expansion, though its effects could be limited in the absence of a complementary fiscal stimulus, in particular in those countries where the implementation of structural reforms brings long term gains but short term losses.
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Assessing European Competitiveness: The New CompNet Microbased Database

Paloma Lopez-Garcia, Filippo di Mauro
ECB Working Paper, Nr. 1764, 2015
Abstract
Drawing from confidential firm-level balance sheets for 17 European countries (13 Euro-Area), the paper documents the newly expanded database of cross-country comparable competitiveness-related indicators built by the Competitiveness Research Network (CompNet). The new database provides information on the distribution of labour productivity, TFP, ULC or size of firms in detailed 2-digit industries but also within broad macrosectors or considering the full economy. Most importantly, the expanded database includes detailed information on critical determinants of competitiveness such as the financial position of the firm, its exporting intensity, employment creation or price-cost margins. Both the distribution of all those variables, within each industry, but also their joint analysis with the productivity of the firm provides critical insights to both policy-makers and researchers regarding aggregate trends dynamics. The current database comprises 17 EU countries, with information for 56 industries, including both manufacturing and services, over the period 1995-2012. The paper aims at analysing the structure and characteristics of this novel database, pointing out a number of results that are relevant to study productivity developments and its drivers. For instance, by using covariances between productivity and employment the paper shows that the drop in employment which occurred during the recent crisis appears to have had “cleansing effects” on EU economies, as it seems to have accelerated resource reallocation towards the most productive firms, particularly in economies under stress. Lastly, this paper will be complemented by four forthcoming papers, each providing an in-depth description and methodological overview of each of the main groups of CompNet indicators (financial, trade-related, product and labour market).
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Understanding the Great Recession

Mathias Trabandt, Lawrence J. Christiano, Martin S. Eichenbaum
American Economic Journal: Macroeconomics, Nr. 1, 2015
Abstract
We argue that the vast bulk of movements in aggregate real economic activity during the Great Recession were due to financial frictions. We reach this conclusion by looking through the lens of an estimated New Keynesian model in which firms face moderate degrees of price rigidities, no nominal rigidities in wages, and a binding zero lower bound constraint on the nominal interest rate. Our model does a good job of accounting for the joint behavior of labor and goods markets, as well as inflation, during the Great Recession. According to the model the observed fall in total factor productivity and the rise in the cost of working capital played critical roles in accounting for the small drop in inflation that occurred during the Great Recession.
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EFN Report Winter 2014/15: Economic Outlook for the Euro Area in 2015 and 2016

EFN Reports, Nr. 1, 2015
Abstract
At the beginning of the year 2015 crude oil is, with little more than 50 dollars per barrel (Brent), about 50% cheaper than in the summer 2014. The oil price hike is a stimulus for the whole world economy, even though the gains of energy users are matched by losses of the suppliers: oil producing countries frequently run high current account surpluses vis-à-vis the rest of the world. It is therefore plausible to assume that, reacting to the redistribution of incomes, the oil user countries will increase their spending by more than what will be lost in spending by producers. Investment activity in the euro area has recently been particularly weak. Remarkably, investment in Greece, Portugal, and Spain, i.e. in countries that had to accept international support during the euro crisis, has strengthened. The setback took place in the so-called core countries, including Germany. Consumption growth was also subdued. Lower oil prices, by increasing real incomes of consumers and lowering production costs for firms, should increase private consumption and, in particular, investment. Moreover, the depreciation of the euro will favour exports. Overall, according to our forecasts, the euro area GDP will grow by 1.3% in 2015 and by 1.6% in 2016. GDP growth is about 0.3 percentage points higher due to the impact of lower oil prices in 2015. However, these forecasts are subject to substantial uncertainty, and we do not see any significant reduction of the unemployment rate during the forecasting horizon. Our inflation forecast for 2015 is 0.3%, with the possibility of a mild deflation not excluded. In 2016 inflation will increase up to 1.1%, still clearly below the 2% ECB’s target. This calls for further monetary expansion, though its effects could be limited in the absence of a complementary fiscal stimulus. The expansionary cyclical policies should be combined with more structural reforms to enhance the competitiveness of the euro area and its growth potential, which in our forecasts remains quite limited. In fact, we expect potential output to grow by only 0.4% both in 2015 and 2016.
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Euro Area External Imbalances and the Burden of Adjustment

Filippo di Mauro, Francesco Pappadà
Journal of International Money and Finance, November 2014
Abstract
The objective of this paper is to explore the consequences of the correction of Euro area trade imbalances on real exchange rates. This analysis requires one additional dimension with respect to the standard Global Imbalances framework à la Obstfeld and Rogoff (2005), since the adjustment takes place within and outside the Euro area. Both types of adjustments are analyzed in a three-country general equilibrium model with a tradable and a non-tradable sectors, and heterogeneous firms built upon Pappadà (2011). ECB (CompNet) data are used to measure the differences in firm size and productivity dispersion across Euro area countries. With respect to the surplus country (Germany), countries running a trade deficit (Spain, Italy) are characterised by a productivity distribution with a lower mean and a less fat right tail. This increases the relative price movement associated with the external adjustment because of the limited role played by the extensive margin. We show that the real exchange rate movements are underestimated when the cross-country differences in terms of productivity distributions are neglected.
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EFN Report Summer 2014: Economic Outlook for the Euro Area in 2014 and 2015

, 2014
Abstract
World growth disappointed at the beginning of the year, when in the US extremely cold weather caused production to contract, the recovery in the euro area stumbled and the slowdown of the Chinese economy continued. At present, however, confidence indicators and order books point to a moderate pickup of growth in most regions. Prices on markets for energy, real and financial assets have reacted little to recent bad news about rising geopolitical risks in the Middle East and Eastern Europe up to now. A sudden increase of risk aversion or a change of believes among investors could trigger a swift deterioration of financial conditions for the world economy. In the euro area, strong stimuli from abroad are not to be expected and private households continue to keep their real spending about constant. Investment has been expanding since summer 2013, but at a very moderate rate. In this context, our forecast for GDP growth is 1.1% in 2014 and 1.6% in 2015. For 2014 and 2015, we do not see any significant reduction of the unemployment rate, because employment dynamics will stay weak due to subdued growth and the still rising participation rate in the euro area. Our inflation forecast for 2014 is 0.6%. In 2015 inflation will also remain subdued, at about 1.0%. In this context of very low price dynamics, monetary policy keeps the recovery alive: official interest rates around zero and the search for yields on financial markets have depressed yields for government bonds; the fall in financing costs allows euro area governments to conduct fiscal policies that are much less restrictive than in the years before, with tax cuts in Italy, France, and Spain starting this year. Nonfinancial firms benefit from a shrinking burden of interest payments, and the availability of bank loans for small and medium enterprises has improved since 2012 in most countries.
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Macroeconomic Factors and Microlevel Bank Behavior

Claudia M. Buch, S. Eickmeier, Esteban Prieto
Journal of Money, Credit and Banking, Nr. 4, 2014
Abstract
We analyze the link between banks and the macroeconomy using a model that extends a macroeconomic VAR for the U.S. with a set of factors summarizing conditions in about 1,500 commercial banks. We investigate how macroeconomic shocks are transmitted to individual banks and obtain the following main findings. Backward-looking risk of a representative bank declines, and bank lending increases following expansionary shocks. Forward-looking risk increases following an expansionary monetary policy shock. There is, however, substantial heterogeneity in the transmission of macroeconomic shocks, which is due to bank size, capitalization, liquidity, risk, and the exposure to real estate and consumer loans.
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