Consumption,welfare, and stochastic population dynamics when technology shocks are (Un)tied

The impact of uncertainty on consumption and welfare seems obvious; because of the precautionary saving motive, higher uncertainty reduces consumption, and subsequently, deteriorates welfare. Recent several studies, however, find that this intuitive narrative is not necessarily true. This paper provides the analytical underpinnings for this. In the absence of technological progress, I find that the larger demographic shocks always reduce consumption, but improve the welfare of households. Moreover, when demographic shocks are negatively tied to technology shocks, there emerges an inverted-U relationship between the size of two shocks and consumption, and a U-shaped relationship between the size of two shocks and household welfare. These results are all characterized analytically in the framework of the stochastic two-sector growth model featuring the correlated Brownian motion process. The findings suggest that demographic policies should not be implemented with no reference to the state of technology.     

IDIOSYNCRATIC AND AGGREGATE RISKS,INEQUALITY AND GROWTH

The paper disaggregates productivity shocks at a firm level into idiosyncratic and aggregate risks, and studies their impacts on inequality, growth and welfare. It develops a growth model with human capital and incomplete insurance and credit markets that provides a closed‐form solution for income inequality dynamics. We find that uninsured idiosyncratic risks are the most important determinants of inequality, growth and welfare. They are the source of nondegenerate wealth distribution. A lower weight of these shocks leads to lower steady‐state inequality, higher growth and welfare. A redistribution of income that serves as social insurance against such risks increases welfare and decreases inequality. But, it also decreases growth by distorting individual consumption and saving decisions.     

两种冲击视角下中国城乡经济波动福利成本研究*

经济波动福利成本的准确测算，一方面能够对经济波动根源的差异化理论做出评判，另一方面也直接关系到政府对于经济政策的选择。本文基于Lucas福利成本模型，采用BN分解公式对消费序列进行分解，估计了暂时性冲击和持久性冲击所造成的经济波动福利成本。本文研究证实，持久性冲击所造成的经济波动福利成本远大于暂时性冲击所造成的福利成本，避免不利供给因素所带来的持久性冲击，是增进城乡居民福祉的重要举措。这与当前所实施的“供给侧结构性改革”相契合。     

Self-insurance vs. self-financing: A welfare analysis of the persistence of shocks

We study the welfare cost of market incompleteness in a generalized Bewley model where idiosyncratic risk takes the form of entrepreneurial productivity shocks. Market incompleteness in our framework has two dimensions. First, in the Bewley tradition, only a limited set of instruments for consumption smoothing is available. Second, entrepreneurs? capital rental is subject to collateral constraints. As is well known, it is harder to self-insure against more persistent shocks, and the welfare cost of missing consumption insurance increases with shock persistence. On the other hand, with collateral constraints, an increase in shock persistence leads to better allocation of production factors through entrepreneurs? self-financing, and the welfare cost of imperfect capital rental markets decreases with shock persistence. The overall welfare cost of market incompleteness can be increasing, decreasing, or even non-monotone in shock persistence, depending on the relative strengths of its two components—the cost of missing insurance and the cost of imperfect capital markets.     

Optimal Monetary Policy and Sectoral Shocks: Is International Monetary Cooperation Beneficial?

A stochastic general‐equilibrium model is used to explore the welfare effects of optimal monetary policy and the potential benefits of policy coordination. Cross‐country perfectly symmetric shocks in the traded goods sectors and imperfectly correlated shocks in the non‐traded goods sectors are considered. In this set‐up, monetary policy may not be able to achieve efficient sectoral resource allocations within countries and avoid inefficient relative price changes across countries. Welfare gains from coordination are sizable if the shocks to the traded and non‐traded goods sectors are negatively correlated and both sectors are of roughly equal size.     

A Poole Analysis in the New Open Economy Macroeconomic Framework*

This paper evaluates simple monetary policy rules in the tradition of the Poole analysis within a general two‐country model for a large economy and a small open economy. The results for the large economy resemble those of the original Poole scenario and also extend to the welfare measure. In particular, an interest rate rule is preferable to a money supply rule when liquidity shocks dominate, whereas a money supply rule fares better with real shocks. For the small open economy, the stabilization properties of the large‐economy case continue to hold for domestic shocks, but a money supply rule performs better than an interest rate rule using the welfare measure. If shocks originate in the foreign economy, a money supply rule turns out to be superior both in terms of its stabilization properties as well as in terms of welfare.     

INTEREST RATE RULES AND WELFARE IN OPEN ECONOMIES

This paper analyses the welfare performance of a set of five alternative interest rate rules in an open economy stochastic dynamic general equilibrium model with nominal rigidities. A rule with a lagged interest rate term, high feedback on inflation and low feedback on output is found to yield the highest welfare for a small open economy. This result is robust across different degrees of openness, different sources of home and foreign shocks, alternative foreign monetary rules and different specifications for price-setting behaviour. The same rule emerges as both the Nash and cooperative equilibria in a two-country version of the model.     

The consequences of an unknown debt target

Several proposals to reduce U.S. debt reveal large differences in their targets. We examine how an unknown debt target affects economic activity using a real business cycle model in which Bayesian households learn about a state-dependent debt target in an endogenous tax rule. Recent papers use stochastic volatility shocks to study fiscal uncertainty. In our setup, the fiscal rule is time-varying due to unknown changes in the debt target. Households infer the current debt target from a noisy tax rule and jointly estimate the transition probabilities. Three key findings emerge from our analysis: (1) limited information about the debt target amplifies the effect of tax shocks through changes in expected tax rates; (2) the welfare losses are an order of magnitude larger when both the debt target state and transition matrix are unknown than when only the debt target state is unknown to households; (3) an unknown debt target likely reduced the stimulative effect of the ARRA and uncertainty about the sunset provision in the Bush tax cuts may have slowed the recovery and led to welfare losses.     

CAN HOUSEHOLDS AND WELFARE STATES MITIGATE RISING EARNINGS INSTABILITY?

We compare the evolution of earnings instability in Germany and the United Kingdom, two countries which stand for different types of welfare states. Deploying data from the German Socio‐Economic Panel (SOEP) and the British Household Panel Survey (BHPS), we estimate permanent and transitory variances of male income over the period 1984–2009 and 1991–2006, respectively. Studies in this literature generally use individual labor earnings. To uncover the role of welfare state and households in smoothening earnings shocks, we compute different income concepts ranging from gross earnings to net equivalent household income. We find evidence that the overall inequality of earnings in Germany and the United Kingdom has been rising throughout the period due to both higher permanent earnings inequality and higher earnings volatility. However, taking institutions of the welfare state and risk‐sharing households into account, we find that the volatility of net household income has remained fairly stable. Furthermore, redistribution and risk insurance provided by the welfare state is more pronounced in Germany than in the United Kingdom.     

Inflation in Open Economies with Complete Markets

This paper uses an overlapping generations model to analyze monetary policy in a two-country model with asymmetric shocks. Agents insure against risk through the exchange of a complete set of real securities. Each central bank is able to commit to the contingent monetary policy rule that maximizes domestic welfare. In an attempt to improve their country’s terms of trade of securities, central banks choose to commit to costly inflation in favorable states of nature. In equilibrium the effects on the terms of trade wash out, leaving both countries worse off. Countries facing asymmetric shocks may therefore gain from monetary cooperation.     

Foreign Debt,Foreign Direct Investment and Volatility

We investigate how foreign debt and foreign direct investment (FDI) affect the growth and welfare of a stochastically growing small open economy. First, we find that foreign debt influences the growth of domestic wealth by lowering the cost of capital, while FDI affects the country's welfare by providing an additional source of permanent income. Second, a decline in domestic investment may improve domestic welfare as FDI replaces the gap. Even when the welfare deteriorates, its magnitude is mitigated, leaving more room for discretionary fiscal policy. Third, a fiscal policy aimed to stabilize domestic output fluctuations needs to be conducted not to crowd out the welfare benefit of FDI too much. Fourth, an economy with both types of foreign capital experiences wider welfare swings by external volatility shocks than the one with foreign debt alone, while the welfare effects from domestic volatility shocks are mitigated. The welfare effects of fiscal shocks are much smaller with both types of foreign capital. Lastly, the first-best labor income tax covers the government absorption by the labor's share of total output, and the capital income tax covers the rest. Investment is penalized or subsidized depending on the social marginal cost-gain differential.     

A welfare analysis of social security in a dynastic framework*

In this article, we study the welfare effects of unfunded social security in a general equilibrium model populated with overlapping generations of altruistic individuals that differ in lifetime expectancy and earnings ability. Contrary to previous research, our results indicate that steady‐state welfare increases with social security for most households, although by very different amounts. This result is mainly due to two factors. First, the presence of two‐sided altruism significantly mitigates the crowding out effect of unfunded social security. Second, ability shocks and uncertain lifetimes generate significant heterogeneity among households to yield different induced preferences for social security.     

What if people value nature? Climate change and welfare costs

We introduce temperature shocks and preferences for environmental quality in a real business cycle model with natural resources. Temperature anomalies are transmitted to the business cycles via their negative effects on output and agents’ utility. Our findings suggest that permanent and temporary weather shocks propagation and their welfare implications depend crucially on whether agents value environmental quality. A permanent increase in temperature reduces output with damages reaching up to 1.61% of GDP. Agents who value environmental quality experience a higher temporary welfare gain when facing a negative weather shock, but welfare drops faster as the economy returns to equilibrium. Temperature anomalies amplify the (negative) effect of climate change on natural resources use and welfare.     

Wage-setting coordination in a small open economy*

This paper studies wage-setting coordination in a two-sector, open economy dynamic stochastic general equilibrium model. Two large sectoral unions anticipate the effects of their wage demands on aggregate variables. In an open economy, there are externalities that the unions can take into account to increase aggregate welfare, but the strategic interaction between the sectoral unions tends to erode this gain. When wage coordination takes place through a wage norm set by either of the sectors, this minimizes the strategic interaction. However, wage norms create welfare losses as sector-specific wage adjustment is required to make an efficient adjustment to shocks.     

MONETARY AND FISCAL POLICY EFFICIENCY AND COORDINATION IN A MULTI‐SECTOR OPEN‐ECONOMY GENERAL EQUILIBRIUM MODEL

The paper analyzes monetary and fiscal stabilization and coordination in a multi‐sector stochastic new open economy macroeconomics (NOEM) model. It first aims to assess the capacity of fiscal and monetary policy to reduce or eliminate the negative welfare effects of an unanticipated productivity shock affecting some or all of the sectors in each country. Second, it evaluates the possible gains from international monetary cooperation as well as the impact of active fiscal policy on the welfare performance of monetary policy. The setup also allows for international asymmetry concerning the uncertainty over the shocks. The results show that monetary and fiscal policies are efficient tools of stabilization and under several conditions they can replicate the flexible‐price equilibrium. However, their welfare performance is not necessarily increased when both monetary and fiscal policies react to shocks at the national level. The existence of bilateral gains from monetary cooperation depends on the degree of asymmetry concerning the uncertainty over the shocks.     

Evaluating international financial integration under leverage constraints

The global financial crisis has undermined many economists' views about the benefits of open financial markets. Anecdotal evidence seems to indicate that financial linkages may propagate shocks during crises. This paper develops a simple two-country model in which financial liberalisation across countries takes place in the presence of credit market distortions within countries. Countries may be subject to macro risk coming from productivity shocks and direct shocks to the credit system (‘financial shocks’). Three different degrees of financial linkages between countries are examined. It is shown that the type of financial integration is critical for both macroeconomic outcomes and welfare. In particular, financial integration in bond markets alone may increase aggregate consumption volatility and reduce welfare. Financial integration in both bond and equity markets generates high positive co-movement across countries, but is welfare-improving.     

Risk sharing in the Middle East and North Africa

This study investigates welfare gains and channels of risk sharing among 14 Middle Eastern and North African (MENA) countries, including the oil‐rich Gulf region and the resource‐scarce economies such as Egypt, Morocco and Tunisia. The results show that for the 1992–2009 period, the overall welfare gains across MENA countries were higher than those documented for the Organization for Economic Cooperation and Development (OECD) nations. In the Gulf region, the amount of factor income smoothing does not differ considerably when output shocks are longer lasting rather than transitory, whereas the amount smoothed by savings increases remarkably when shocks are longer lasting. In contrast, both factor income flows and international transfers respond more to permanent shocks than to transitory shocks in the non‐oil MENA countries. The results also show that a significant portion of shocks is smoothed via remittance transfers in the economically less‐developed MENA countries, but not in the oil‐rich Gulf and OECD countries. Finally, for the overall MENA region, a large part of the shock remains unsmoothed, suggesting that more market integration is needed to remedy the weak link of incomplete risk sharing.     

On the empirics of risk-sharing across MENA countries

In this article, we compute the potential welfare gains and the realized gains from risk-sharing among Middle East and North African (MENA) countries, including the oil-rich Gulf region and the resource-scarce economies. We find that the overall potential welfare gains across MENA countries are positive for all countries under the assumption of full risk-sharing. The potential welfare gains among the six Gulf Cooperation Council (GCC) countries are positive even though the magnitudes are smaller compared to those of the rest of the MENA region. We also quantify the extent of risk-sharing for the MENA region and show that it is significant for the MENA region and its subgroups; however, we could not find any sign of inter-temporal smoothing across the same groups. Decomposing the aggregate output shocks shows that the extent of risk-sharing is significant when only positive output shocks exist across the resource-scarce MENA economies. However, we observe that GCC countries share output risks with each other even under negative output shocks.     

Monetary policy and noise traders: A welfare analysis

This paper studies the choice of monetary policy regime in a small open economy with noise traders in forex markets. We focus on two simple rules: fixed exchange rates and inflation targeting. We contrast the above two rules against optimal policy with commitment under productivity shocks. In general, the presence of noise traders increases the desirability of a fixed exchange rate regime. We also evaluate the welfare impact of Tobin taxes in this milieu. These taxes help unambiguously in the absence of productivity shocks; their welfare impact under productivity shocks depends on the monetary regime in place and trade elasticity between domestic and foreign goods.