Galo Nuño

Saudi Arabia and the Oil Market

In this study, we document two features that have made Saudi Arabia different from other oil producers. First, it has typically maintained ample spare capacity. Second, its production has been quite volatile even though it has witnessed few domestic shocks. These features can be rationalised in a general equilibrium model in which the oil market is modelled as a dominant producer with a competitive fringe. We show that the net welfare effect of oil tariffs on consumers is null. The reason is that Saudi Arabias monopolistic rents fall entirely on fringe producers.

Quantitative effects of the shale oil revolution

The aim of this paper is to analyze the impact of the so-called “shale oil revolution” on oil prices and economic growth. We employ a general equilibrium model of the world oil market in which Saudi Arabia is the dominant firm, with the rest of the producers as a competitive fringe. Our results suggest that most of the expected increase in US oil supply due to the shale oil revolution has already been incorporated into prices and that it will produce an additional increase of 0.2% in the GDP of oil importers in the period 2010–2018. We also employ the model to analyze the collapse in oil prices in the second half of 2014 and conclude that it was mainly due to positive unanticipated supply shocks.

Controlling a Distribution of Heterogeneous Agents

This paper analyzes the problem of a benevolent planner wishing to control a population of heterogeneous agents subject to idiosyncratic shocks. This is equivalent to a deterministic control problem in which the state variable is the cross-sectional distribution. We show how, in continuous time, this problem can be broken down into a dynamic programming equation plus the law of motion of the distribution, and we introduce a new numerical algorithm to solve it. As an application, we analyze the constrained-efficient allocation of an Aiyagari economy with a fat-tailed wealth distribution. We fi nd that the constrained-efficient allocation features more wealth inequality than the competitive equilibrium.

Monetary Policy and Sovereign Debt Vulnerability

We investigate the trade-offs between price stability and the sustainability of sovereign debt, using a small open economy model where the government issues nominal defaultable debt and chooses fiscal and monetary policy under discretion. Inflation reduces the real value of outstanding debt, thus making it more sustainable; but it also raises nominal yields and entails direct welfare costs. We compare this scenario with a situation in which the government gives up the ability to deflate debt away, e.g. by issuing foreign currency debt or joining a monetary union with an anti-inflationary stance. We find that the benefits of giving up this adjustment margin outweigh the costs, both for our preferred calibration and for a wide range of parameter values.

Optimal Monetary Policy with Heterogeneous Agents

We analyze optimal monetary policy under commitment in an economy with uninsurable idiosyncratic risk, long-term nominal claims and costly inflation. Our model features two prominent redistributive channels of monetary policy: the classic Fisherian channel, and unhedged interest rate exposure (URE). The former introduces a “redistributive inflationary bias”, stemming from the fact that debtors (who benefit from inflation) have a higher marginal utility than creditors. This bias is counteracted over time by a disinflationary motive: a commitment to low future inflation raises bond prices, benefiting bond-issuing households (i.e. those with negative URE), who also have a higher marginal utility than bond-purchasing ones. The result is optimal inflation front-loading. Under certain conditions, both motives cancel out asymptotically and optimal long-run inflation is zero. Numerically, we find that optimal policy achieves first-order consumption and welfare redistribution vis-a-vis a zero inflation policy.

Technology, Convergence and Business Cycles

In this paper we integrate Schumpeterian endogenous growth into a general equilibrium framework. By explicitely modelling the innovation and technology adoption process we are able to match some stylized economic facts such as entry rates and survival times of firms in the U.S. economy or the maximum convergence rates accross countries. Additionally, it allows us to propose a new definition of what a technology shock is and to compare it with the standard definition. Results show how this framework provides a plausible description of how economies grow and respond to the arrival of new technologies.

Learning from experience in the stock market

New evidence suggests that individuals “learn from experience,” meaning they learn from events occurring during their lives as opposed to the entire history of events. Moreover, they weigh more heavily recent events compared to events occurring in the distant past. This paper analyzes the implications of such learning for stock pricing in a model with finitely lived agents. Individuals learn about the rate of change of the stock price and of dividends using a weighted decreasing-gain algorithm. As a result of waves of optimism and pessimism, the stock price exhibits stochastic fluctuations around the rational expectations equilibrium. Conditional on the historical path of dividends, the model produces a price–dividend ratio which is in line with the evidence for the last century, except for the “dot-com” bubble in the 1990s.

A general equilibrium model of the oil market

We present a general equilibrium model of the global oil market, in which the oil price, oil production, and consumption, are jointly determined as outcomes of the optimizing decisions of oil importers and oil exporters. On the supply side the oil market is modelled as a dominant firm – Saudi Aramco – with competitive fringe. We establish that a dominant firm may exist as long as it enjoys a cost advantage over the fringe. We provide an expression for the optimal markup and compute the spare capacity maintained by such a firm. The model produces plausible dynamics in response to oil supply and oil demand shocks. In particular, it reproduces successfully the jump in oil output of Saudi Aramco following the output collapse of Iraq and Kuwait during the first Gulf War, explaining it as the profit-maximizing response of the dominant firm. Oil taxes and subsidies affect the oil price and welfare through their effect on the trade-off between oil production efficiency and oil market competition.

Money Dynamics with Multiple Banks of Issue: Evidence from Spain 1856-1874

This paper analyzes the Spanish monetary system from 1856, when the Bank of Spain was created, to 1874, when it was awarded the monopoly of emission. This period was characterized by the emergence of an unregulated banking system, with multiple banks of issue entitled to emit bank notes. We focus on two main issues: i) the large fluctuations in the money supply during this period; and ii) the lack of a lender of last resort in the banking panic of 1866. To analyze this, we construct a new dataset on money supply aggregates. The paper also estimates the economic impact of monetary fluctuations with the help of a calibrated new Keynesian model. Our results suggest that money supply shocks had a milder effect on inflation and output than the one predicted by the theory.

Does TFP drive Housing Prices? A Growth Accounting Exercise for Four Countries

Housing prices diverge from construction prices after 1997 in four major countries. Besides, TFP differences between construction and the general economy account for the evolution of construction prices in the U.S. and Germany, but not in the U.K. and Spain.