To cointegrate or not to cointegrate? That's a topological question

We show that for any multivariate I( 1) process which does not cointegrate, it is possible to find another process sufficient1y elose to it where cointegration applies. Closeness is defined in terms of the spectral density matrices of the respective processes in differences, i.e., a metric which takes into account only the information in the (centred) second moments. The result may explain why in practice cointegration is found a bit "too often". Examples developing this point and simulations giving an insight on the metric used are also presented.

Inequality treatment effects

This paper presents semiparametric estimators for treatment effects parameters when selection to treatment is based on observable characteristics. The parameters of interest in this paper are those that capture summarized distributional effects of the treatment. In particular, the focus is on the impact of the treatment calculated by differences in inequality measures of the potential outcomes of receiving and not receiving the treatment. These differences are called here inequality treatment effects. The estimation procedure involves a first non-parametric step in which the probability of receiving treatment given covariates, the propensity-score, is estimated. Using the reweighting method to estimate parameters of the marginal distribution of potential outcomes, in the second step weighted sample versions of inequality measures are.computed. Calculations of semiparametric effciency bounds for inequality treatment effects parameters are presented. Root-N consistency, asymptotic normality, and the achievement of the semiparametric efficiency bound are shown for the semiparametric estimators proposed. A Monte Carlo exercise is performed to investigate the behavior in finite samples of the estimator derived in the paper.

Measuring core inflation as the common trend of prices

In recent years, many central banks have adopted inflation targeting policies starting an intense debate about which measure of inflation to adopt. The literature on core inflation has tried to develop indicators of inflation which would respond only to "significant" changes in inflation. This paper defines a measure of core inflation as the common trend of prices in a multivariate dynamic model, that has, by construction, three properties: it filters idiosyncratic and transitory macro noises, and it leads the future leveI of headline inflation. We also show that the popular trimmed mean estimator of core inflation could be regarded as a proxy for the ideal GLS estimator for heteroskedastic data. We employ an asymmetric trimmed mean estimator to take account of possible skewness of the distribution, and we obtain an unconditional measure of core inflation.

Capital flows and monetary control under a domestic currency substitution regime: the recent Brazilian experience

The 90s have witnessed a resumption in capital flows to Latin America. due to the conjugation of low interest rates in the US and economic reforms in most LA countries. In Brazil. however. substantial capital flows have becn induced by the extremely high domestic interest rates practiced by the Central Bank as a measure of last reson given the absence of successful stabilization policies. These very high interest rates were needed to prevent capital flight in a context of a surprisingly stable inflation rate above 20% a month. and keep interest bearing govemment securities preferable to foreign assets as money substitutes. We carefully describe how this domestic currency substitution regime (interest bearing govemment securities are substituted for MIas cash holdings) requires the Central Bank to renounce aoy control over monerary aggregates. In this domestic currency substitution regime. hyperinflation is the most likely outcome of an isolated (i.e.. without fiscal adjusanents) attempt by the Brazilian Central Bank to control money.

Health and development with imperfect capital markets

This paper investigates the interaction between investment in education and in life-expanding investments, in a simple two-period model in which individuaIs are liquidity constrained in the first period. We show that under low leveIs of health and capital, investments in human capital and in health are complement: since the probability of survival is small, there is littIe incentive to invest in human capital; therefore the return on health investment is also low. This reinforcing effect does not hold for higher leveIs of health or capital, and the two investments become substitute. This property has many consequences. First, subsidizing health care may have dramatically different effects on private investment in human capital, depending on the initial leveI of health and capital. Second, the assumption that mortality is endogenous induces an increase in inequality of income: since health investment is a normal good, the return on education is also lower for poor individuaIs. Third,in a non-overlapping generation madel with non-altruistic agents, the hea1th leveI of the population has strong consequences on growth. For a very low leveI of hea1th, mortality is too high for the investment on education to be profitable. For a higher, but still low, levei of hea1th the economy grows on1y if the initial stock of capital is high enough; bad health and low capital create a poverty trapo Fourth, we compare redistributive income policies versus public hea1th measures. Redistributing income reduces both static and dynamic inequality, but slows growth. In contrast, a paternalistic health policy that forces the poor to invest in hea1th reduces dynamic inequality and may foster growth.

O prêmio de risco da taxa de câmbio no Brasil durante o plano real

A principal explicação sugerida pela literatura para o viés do preço futuro em relação à taxa de câmbio que prevalecerá no futuro é a existência de um prêmio de risco. Aplicamos aqui os principais modelos teóricos e técnicas econométricas para identificação e mensuração do prêmio de risco aos dados brasileiros do mercado futuro de câmbio posteriores ao Plano Real. Identifica-se um prêmio de risco que varia ao longo do tempo, o qual correlaciona-se com os fundamentos macroeconômicos da economia. A partir de 1999, coerentemente com a introdução da livre flutuação cambial, observou-se uma diminuição da importância do prêmio de risco relativamente aos erros de previsão na composição do forward discount. As técnicas empregadas permitem-nos avaliar importantes questões de política econômica, como o quanto podem cair as taxas de juros reais.

The effects of openness on industrial employment in Brazil

Este artigo tem dois objetivos principais. Primeiramente, apresentamos as pnnClpms evidências de que a baixa qualidade do emprego é o maior problema do mercado de trabalho brasileiro. Mostra-se que o país tem absorvido um crescimento da oferta de trabalho significativo ao longo dos últimos anos sem registrar um aumento da taxa de desemprego. No entanto, os postos de trabalho no Brasil são, em média, extremamente precários. Em grande medida, a precariedade do emprego no Brasil está relacionada à alta rotatividade da mão-de-obra, que desincentiva o investimento em treinamento, impedindo o crescimento da produtivid::;de do trabalho. De acordo com os indicadores passíveis de comparação internacional, o Brasil apresenta uma das maiores taxas de rotatividade do mundo. Em segundo lugar, estuda-se a evolução recente do emprego industrial, uma vez que o setor industrial está tradicionalmente associado à geração de bons empregos no Brasil. Mostra-se que o nível de emprego industrial tem se reduzido de forma praticamente contínua desde o início desta década. A estimação de um modelo de ajustamento parcial do emprego nos permite explicar este fenômeno. Mudanças estruturais significativas na elasticidade custo salarial do emprego e no coeficiente de tendência são detectadas a partir do início da década de 90. Um simples modelo teórico é usado de forma a interpretar estas mudanças estruturais como a resposta ótima das empresas industriais ao ambiente de maior competição externa, devido à abertura comercial. Isto, junto com o uso crescente de tecnologias poupadoras de mão-de-obra, são suficientes para explicar a brutal queda do emprego industrial no Brasil ao longo dos últimos seis anos.

Pricing the option adjust spread of Brazilian Eurobonds

This paper presents results of a pricing system to compute the option adjusted spread ("DAS") of Eurobonds issued by Brazilian firms. The system computes the "DAS" over US treasury rates taktng imo account the embedded options present on these bonds. These options can be calls ("callable bond"), puts ("putable bond") or combinations ("callable and putable bond"). The pricing model takes into account the evolution of the term structure along time, is compatible with the observable market term structure and is able to compute risk measures such as duration and convexity, and pricing and hedging of options on these bonds. Examples show the ejJects of the embedded options on the spread and risk measures as well as the ejJects on the spread due to variations on the volatility parameters ofthe short rate.

Does monetary policy stabilize the exchange rate following a currency crisis?

This paper provides evidence on the relationship between rnonetary policy and the exchange rate in the aftermath of currency crises. It ana1yzes a large data set of currency crises in 80 countries in the period 1980 to 1998. The rnain question addressed is: can rnonetary policy significantly alter the probability of reversing the post-crisis undervaluation through nominal appreciation rather than higher int1ation? We find that tight rnonetary policy facilitates the reversal of currency undervaluation through nominal appreciation rather than inflation. When the econorny is also facing a banking crisis, depending on the specification, tight rnonetary policy rnay not have the same effect.

Balance of payment crises and capital flows : the role of liquidity

A model of externaI CrISIS is deveIoped focusing on the interaction between Iiquidity creation by financiaI intermediaries and foreign exchange collapses. The intermediaries' role of transforming maturities is shown to result in larger movements of capital and a higher probability of crisis. This resembles the observed cycle in capital fiows: large infiows, crisis and abrupt outfiows. The mo deI highlights how adverse productivity and international interest rate shocks can be magnified by the behavior of individual foreign investors linked together through their deposits in the intermediaries. An eventual collapse of the exchange rate can link investors' behavior even further. The basic model is then extended, quite naturally, to study the effects of capital fiow contagion between countries.