mitigating the consequences of a health condition the role of intra and interhousehold assistance the behavior of noncoresident family members motivates much of the literature on consumption smoothing risk sharing and informal networks yet little is known empirically on the topic due to a lack of data simultaneously observing multiple households in an extended family this study utilizes genealogically linked longitudinal data to examine how extended family networks insure against financial risks from severely limiting health conditions we find that nonhealth consumption of unmarried households declines in response to worsening health whereas married households smooth expenditures in a way that is consistent with full insurance families mitigate losses by reallocating home production drawing down home equity holding formal health insurance collecting social security and receiving transfers from noncoresident relatives we illustrate that the costs of health shocks are transmitted throughout family networks and that noncoresident children draw down their assets and consumption when responding to a parent s health decline

real options agency conflicts and optimal capital structure abstract we examine the impact of a stockholder bondholder conflict over the timing of the exercise of an investment option on firm value and corporate financial policy we find that an equity maximizing firm exercises the option too early relative to a value maximizing strategy and we show how this problem can be characterized as one of overinvestment in risky investment projects equityholders incentive to overinvest significantly decreases firm value and optimal leverage and significantly increases the credit spread of risky debt numerical solutions illustrate how the agency cost of overinvestment and its effect on corporate financial policy vary with firm and project characteristics

health shocks and risk aversion we empirically assess whether a health shock influences individual risk aversion we use grip strength data to obtain an objective health shock indicator in order to account for the non random nature of our data regression adjusted matching is employed risk preferences are traditionally assumed to be constant however we find that a health shock increases individual risk aversion the finding is robust to a series of sensitivity analyses and persists for at least four years after the shock income changes do not seem to be the driving mechanism

oil prices and the stock prices of alternative energy companies energy security issues coupled with increased concern over the natural environment are driving factors behind oil price movements while it is widely accepted that rising oil prices are good for the financial performance of alternative energy companies there has been relatively little statistical work done to measure just how sensitive the financial performance of alternative energy companies are to changes in oil prices in this paper a four variable vector autoregression model is developed and estimated in order to investigate the empirical relationship between alternative energy stock prices technology stock prices oil prices and interest rates our results show technology stock prices and oil prices each individually granger cause the stock prices of alternative energy companies simulation results show that a shock to technology stock prices has a larger impact on alternative energy stock prices than does a shock to oil prices these results should be of use to investors managers and policy makers

leveraged investments and agency conflicts when cash flows are mean reverting we analyse the effect of mean reverting cash flows on the costs of shareholder bondholder conflicts arising from partially debt financed investments in a partial equilibrium setting we find that such agency costs are significantly lower under mean reverting mr dynamics when compared to the ubiquitous geometric brownian motion gbm the difference is attributed to the stationarity of the mr process in addition through the application of a novel agency cost decomposition we show that for a larger speed of mean reversion agency costs are driven mainly by suboptimal timing decisions as opposed to suboptimal financing decisions in contrast under the standard gbm assumption the agency costs are driven mainly by suboptimal financing decisions for large growth rates and by suboptimal timing decisions for smaller or negative growth rates

long term and spillover effects of health shocks on employment and income abstract we use matching combined with difference in differences to identify the causal effects of sudden illness represented by acute hospitalizations on employment and income up to six years after the health shock using linked dutch hospital and tax register data an acute hospital admission lowers the employment probability by seven percentage points and results in a 5 percent loss of personal income two years after the shock there is no subsequent recovery in either employment or income there are large spillover effects household income falls by 50 percent more than the income of the disabled person

longitudinal methods to investigate the role of health determinants in the dynamics of income related health inequality the usual starting point for understanding changes in income related health inequality irhi over time has been regression based decomposition procedures for the health concentration index however the reliance on repeated cross sectional analysis for this purpose prevents both the appropriate specification of the health function as a dynamic model and the identification of important determinants of the transition processes underlying irhi changes such as those relating to mortality this paper overcomes these limitations by developing alternative longitudinal procedures to analyse the role of health determinants in driving changes in irhi through both morbidity changes and mortality with our dynamic modelling framework also serving to identify their contribution to long run or structural irhi the approach is illustrated by an empirical analysis of the causes of the increase in irhi in great britain between 1999 and 2004

institutions health shocks and labour market outcomes across europe this paper investigates the relationship between health shocks and labour market outcomes in 9 european countries using the european community household panel matching techniques are used to control for the non experimental nature of the data the results suggest that there is a significant causal effect from health on the probability of employment individuals who incur a health shock are significantly more likely to leave employment and transit into disability the estimates differ across countries with the largest employment effects being found in the netherlands denmark spain and ireland and the smallest in france and italy differences in social security arrangements help to explain these cross country differences

the lognormal diffusion is hardly an equilibrium price process for exhaustible resources abstract in a model of a competitive spot market for an exhaustible resource under demand uncertainty it is shown that the lognormal diffusion the geometrical brownian motion can hardly be an equilibrium price process under the reasonable assumptions that suppliers choose the time to extract and deposits have different costs each supplier will start extraction when price first exceeds a boundary which depends on that supplier s costs but no new extraction will start during periods when the price is lower than the previously recorded high it is highly unlikely that aggregate demand responds to prices in the same way as supply

valuing flexibility the case of an integrated gasification combined cycle power plant abstract in this paper we analyze the choice between two technologies for producing electricity in particular the firm has to decide whether and when to invest either in a natural gas combined cycle ngcc power plant or in an integrated gasification combined cycle igcc power plant which may burn either coal or natural gas instead of assuming that fuel prices follow standard geometric brownian motions here they are assumed to show mean reversion specifically to follow an inhomogeneous geometric brownian motion first we consider the opportunity to invest in a ngcc power plant we derive the optimal investment rule as a function of natural gas price and the remaining life of the right to invest in addition the analytical solution for a perpetual option to invest is obtained then we turn to the igcc power plant we analyse the valuation of an operating plant when there are switching costs between modes of operation and the choice of the best operation mode this serves as an input to evaluate the option to invest in this plant finally we derive the value of an opportunity to invest either in a ngcc or igcc power plant i e to choose between an inflexible and a flexible technology respectively depending on the opportunity s time to maturity we derive the pairs of coal and gas prices for which it is optimal to invest in ngcc in igcc or simply not to invest numerical computations involve the use of one and two dimensional binomial lattices that support a mean reverting process for coal and gas prices basic parameter values are taken from an actual igcc power plant currently in operation sensitivity of some results with respect to the underlying stochastic process for fuel price is also checked

a model of capital structure when earnings are mean reverting a multiperiod model of optimal capital structure is developed under the assumption that earnings follow an autoregressive process firm value and leverage vary through time and at each date the firm achieves an optimal debt level that is a function of the full state contingent debt policy the reversion parameter of the earnings series is shown to be positively related to various measures of variability and negatively related to leverage if earnings processes are not homogeneous across firms then standard earnings risk measures in capital structure studies do not adequately represent crosssectional differences in variability in firm value

leverage decision and manager compensation with choice of effort and volatility abstract we study the incentive effects of granting levered or unlevered stock to a risk averse manager the stock is granted by risk neutral shareholders who choose leverage and compensation level the manager applies costly effort and selects the level of volatility both of which affect expected return the results are driven by the attempt of the risk neutral shareholders to maximize the value of their claims net of the compensation package we consider a dynamic setting and find that levered stock is optimal for high type managers firms with high momentum large firms and firms for which additional volatility only implies a modest increase in expected return

commodity betas with mean reverting output prices abstract this paper provides a theoretical derivation of commodity beta stock price sensitivity to commodity price using a contingent claim model the model incorporates operating leverage financial leverage costly financial distress and mean reverting commodity prices and highlights the important role played by the speed of reversion of the commodity price it is used to identify theoretically the main determinants of commodity beta commodity beta is predicted to be an increasing function of the operating and financial leverage of the firm and a decreasing function of the company s tax rate and the level volatility and speed of reversion of the commodity price empirical tests with a sample of gold mining firms provide support for these predictions particularly the new implications of the model the effect of the commodity price s speed of reversion and the company s tax rate

how big is the debt overhang problem abstract i re examine the debt overhang problem where the flexible investment level rather than the irreversible decision whether or not to operate is used to measure the underinvestment caused by debt financing i measure a large overhang cost with long term debt or short term debt as is standard underinvestment with long term debt is more severe when investment opportunities are poor and is mitigated as opportunities improve in contrast underinvestment with short term debt remains significant even when investment opportunities are good firms lever up as opportunities improve to take advantage of tax shields so that equity claimants still face the incentive to underinvest

bank earning asset behavior and causality between reserves and money lagged versus contemporaneous reserve accounting abstract this paper empirically examines the impact of lagged reserve accounting on large individual bank behavior its specific objective is to assess the claim that the institution of lra has led to a decoupling of the earning asset and reserve adjustment decisions of banks to accomplish this objective a system of equations which jointly describe the reserve adjustment and earning asset decisions of banks is estimated and tested for differences in the model between the periods before and after 1968 it is found that bank behavior does not differ fundamentally under lra evidence that banks make their earning asset adjustments promptly and that expected future interest rates are important in their decisions is also presented

bank reserve adjustment process and the use of reserve carryover as a reserve management tool a microeconometric approach this papers examines the impact of bank use of the reserve carryover provision on the reserveadjustment process and federal funds rate volatility a discussion of the newly proposed change to contemporaneous reserve accounting is also given the empirical purposes of this paper are accomplished by specifying and estimating a model of bank reserve adjustment behavior in which the interrelatedness of reserve adjustment instruments is explicitly taken into account we conclude that to the extent banks use carryover to express their funds rate forecasts in the market and the federal reserve clearly signals its intended open market course variability in the funds rate and the monetary aggregates is reduced by the carryover provision

bouncing back from health shocks locus of control and labor supply abstract many studies have demonstrated a causal effect of ill health on labor supply in this study i explore the personality related heterogeneity measured by differences in control beliefs in the labor supply response to health shocks to identify such behavioral differences i follow the labor supply trajectories of 649 initially full time employed and healthy men who experience at some point in time an episode of ill health when compared with men who have positive control beliefs men with negative control beliefs are on average 100 more likely to drop out of the labor force a drop out unrelated to early retirement and work on average 12 less hours per week the year after the health shock these behavioral differences remain robust to alternative estimation samples and health shock definitions they are strongest for men from low socioeconomic backgrounds who do not have access to private health insurance or who experience high intensity shocks heterogeneous labor supply responses are also observed for conscientiousness and risk tolerance traits that have been linked with willingness to invest and treatment compliance an important conclusion from the findings is that a small set of non cognitive skills produces long term labor market benefits in the advent of adversity

the effect of mean reversion on investment under uncertainty abstract mean reverting processes are appropriate for most real option investment models yet geometric brownian motion gbm processes are generally used for tractability hassett and metcalf j econom dyn control 19 1995 1471 1488 argue that using a gbm process is justified because mean reversion has two opposing effects it brings the investment trigger closer and also reduces the conditional volatility thereby lowering the likelihood of reaching the trigger and the overall effect on investment should be negligible for most reasonable parameter values this paper extends the hassett and metcalf model by incorporating a third factor the effect of mean reversion on systematic risk the main result is that mean reversion in general does have a significant impact on investment moreover this effect could be either positive or negative depending on various factors such as project duration cost of investing interest rate etc thus it is generally inappropriate to use the gbm process to approximate a mean reverting process

investment under alternative return assumptions comparing random walks and mean reversion abstract many recent theoretical papers have come under attack for modeling prices as geometric brownian motion this process can diverge over time implying that firms facing this price process can earn infinite profits we explore the significance of this attack and contrast investment under geometric brownian motion with investment assuming mean reversion while analytically more complex mean reversion in many cases is a more plausible assumption allowing for supply responses to increasing prices we show that cumulative investment is generally unaffected by the use of a mean reversion process rather than geometric brownian motion and provide an explanation for this result

the effects of shifts in monetary policy and reserve accounting regimes on bank reserve management behavior in the federal funds market abstract this paper looks at the effects on fed fund rates and fed fund purchasing behavior of large banks resulting from i the 1982 regime switch from non borrowed to borrowed reserve targeting by the fed and ii the 1984 switch from lagged to almost contemporaneous reserve accounting cra whether we analyse changes in the interest rate or quantity dimensions the shift in monetary policy targets appeared to have had a more profound effect on the market for bank reserves than the shift in reserve accounting regime these results therefore tend to support the contention that a shift to cra by itself will have little effect on bank reserve management behavior unless combined with its logical counterpart a total reserves target

disability capacity for work and the business cycle an international perspective important policy issues arise from the high and growing number of people claiming disability benefits for reasons of incapacity for work in oecd countries economic conditions play an important part in explaining both the stock of disability benefit claimants and inflows to and outflows from that stock employing a variety of cross country and country specific household panel data sets as well as administrative data we find strong evidence that local variations in unemployment have an important explanatory role for disability benefit receipt with higher total enrolments lower outflows from rolls and often higher inflows into disability rolls in regions and periods of above average unemployment in understanding the nature of the cyclical fluctuations and trends in disability it is important to distinguish between work disability and health disability the former is likely to be influenced by economic conditions and welfare programmes while the latter evolves in a slower fashion with medical technology and demographic changes there is little evidence of health disability being related to the business cycle so cyclical variations are driven by work disability the rise in unemployment due to the current global economic crisis is expected to increase the number of disability insurance claimants

option valuation of claims on real assets the case of offshore petroleum leases this paper extends financial option theory by developing a methodology for the valuation of claims on a real asset an offshore petroleum lease several theoretical and practical problems not present in applying option pricing theory to financial assets are addressed most importantly we show the necessity of combining option pricing techniques with a model of equilibrium in the market for the underlying asset petroleum reserves the advantages of this approach over conventional discounted cash flow techniques are emphasized the methodological development provides important insights for both company behavior and government policy promising empirical results are reported

a microeconometric evaluation of rehabilitation of long term sickness in sweden in this study the effects of various types of rehabilitation programmes on labour market out comes are estimated a main feature of this study is that it jointly evaluates multiple treat ments by nonparametric matching estimators the study is based on a large sample of per sons in western sweden who are long term sick and could participate in rehabilitation pro grammes our results suggest that work place training is superior to the other rehabilitation programmes with respect to labour market outcomes but compared to non participation no positive effects are found doi 10 1002 jae 757 download appendix pdf 147 kb

alternative approaches to evaluation in empirical microeconomics four alternative but related approaches to empirical evaluation of policy interventions are studied social experiments natural experiments matching methods and instrumental variables in each case the necessary assumptions and the data requirements are considered for estimation of a number of key parameters of interest these key parameters include the average treatment effect the treatment on the treated and the local average treatment effect some issues of implementation and interpretation are discussed drawing on the labour market programme evaluation literature

bank reserve adjustment process and the use of reserve carryover as a reserve management tool abstract in light of vogt s 1989 comment on our original paper we reexamine the empirical evidence on how banks use reserve carryover we dispute vogt s characterization of the evidence as contradictory and find nothing in the results to undermine our original conclusion that banks use the reserve carryover provision primarily to hedge reserves costs over time we also correct a computational error that appeared in the original paper

the trade off model with mean reverting earnings theory and empirical tests the trade off theory of capital structure predicts a positive relationship between earnings and leverage contradictory to well established empirical evidence since corporate earnings are known to be mean reverting we reformulate the trade off model with mean reverting earnings we show that with mean reverting earnings there should be a negative relationship between optimal leverage and the current earnings level the model also illustrates the importance of the earnings reversion parameter in the determination of capital structure the major implications of the model are supported by empirical tests carried out with a sample of firms in the s p 500 index

ill health and retirement in britain a panel data based analysis we examine the effect of ill health on retirement decisions in britain using the british household panel survey 1991 1998 as self reported health status is likely to be endogenous to the retirement decision we instrument self reported health by a constructed health stock measure using a set of health indicator variables and personal characteristics as suggested by bound et al bound j schoenbaum m stinebrickner t m waidmann m 1999 the dynamic effects of health on the labor force transitions of older workers labour economics 6 179 202 using a range of econometric techniques we show that adverse shocks to individual health stocks predict individual retirement behaviour among workers aged from 50 until state pension age we compare responses of economic activity to constructed health measures with that arising using direct indicators of functional limitations and specific health problems we also examine the dynamics of health shocks and whether adverse and positive health shocks have symmetric effects on transitions in and out of economic activity

mean reversion in equilibrium asset prices evidence from the futures term structure we use the term structure of futures prices to test whether investors anticipate mean reversion in spot asset prices the empirical results indicate mean reversion in each market we examine for agricultural commodities and crude oil the magnitude of the estimated mean reversion is large for example point estimates indicate that 44 percent of a typical spot oil price shock is expected to be reversed over the subsequent eight months for metals the degree of mean reversion is substantially less but still statistically significant we detect only weak evidence of mean reversion in financial asset prices in this study we provide evidence of mean reversion in the prices of several real and financial assets rather than examining evidence of ex post reversion using time series of asset prices we use price data from futures contracts with varying delivery horizons to test whether investors expect asset prices to revert this approach offers two advantages first since futures prices are readily available for many markets our procedure can be implemented for many assets including those for which reliable spot price data is elusive second there is little ambiguity as to the source of any mean reversion detected using our method subject only to the maintained assumption that the no arbitrage cost of carry condition holds our test detects mean reversion that is expected to occur in equilibrium but has no power to detect mean reversion resulting from noise or inefficiencies our methodology focuses on relations between price levels and the slope of the futures term structure defined as the change across delivery dates in the futures prices observed on a given trading date an inverse relation between prices and the futures term slope constitutes evidence that investors expect mean reversion in spot prices to illustrate initially assume there are no

general properties of option prices when the underlying price process is a one dimensional diffusion as well as in certain restricted stochastic volatility settings a contingent claim s delta is bounded by the infimum and supremum of its delta at maturity further if the claim s payoff is convex concave the claim s price is a convex concave function of the underlying asset s value however when volatility is less specialized or when the underlying process is discontinuous or non markovian a call s price can be a decreasing concave function of the underlying price over some range increasing with the passage of time and decreasing in the level of interest rates much of the financial options literature derives precise option prices when the underlying asset price process is completely specified since it is empirically difficult to ascertain what the true underlying process is another part of that literature is concerned with deriving general properties of option prices when the underlying price process is not fully specified but instead is assumed to belong to some general class of stochastic processes merton 1973 cox and ross 1976 jagannathan 1984 in particular in the absence of arbitrage opportunities and assuming that the risk neutralized stock price follows a proportional stochastic process a risk neutral return distribution independent of price merton 1973 and jagannathan 1984 show that a call option s price is an increasing convex function of the stock price cox and ross 1976

book rate of return and prediction of earnings changes an empirical investigation over the years there has developed a fairly substantial body of research on the time series of earnings as a whole this literature concludes that changes in annual accounting earnings are unpredictable that is earnings follow a random walk 1 based on this result some inferences of economic substance policy have been claimed 2 in this paper we reconsider empirical issues which at least to some extent have been obscured by this conclusion we argue that the above result is only true in a limited sense since a modest enlargement of the predictive information set should allow for a rejection of the hypothesis that earnings changes are

a real options approach to the valuation of a forestry investment abstract the theory of real options is used to model the optimal tree harvesting decision the value of the option to harvest is estimated using a dynamic programming approach and a general numerical solution technique suitable for any type of stochastic process for prices the conditions under which the optimal harvest time is independent of price are examined in addition the impact of assuming future lumber prices are mean reverting is considered it is found that option value and optimal cutting time are significantly different under the mean reversion assumption compared to geometric brownian motion