natural resource accounting there is as yet no consensus on the most appropriate way to incorporate the degradation of environmental capital into national income accounting procedure net product is currently derived by deducting from gross product the depreciation of man made capital only deducting depreciation of natural capital in a similar manner will give a figure for true net product that provides a better indicator of that level of current income which is sustainable into the future the user cost and net price methods of calculating the value of natural resource depreciation are analysed and assessed on the basis of this assessment the net price method is then used to adjust the national accounts of zimbabwe for depletion of forests soils and mineral resources for the period 1980 to 1989 the results suggest that economic depreciation of natural resources represents approximately 2 of annual gdp although this is regarded as a significant underestimate the implications for integrating natural resource depletion into policy making within the current national political climate are then addressed

the demand for assets through a low interest rate environment asset demand is important in many areas of economics to investigate this we estimate a globally flexible dynamic fourier asset demand specification and calculate morishima elasticities of substit

the duration vector a continuous time extension to default free interest rate contingent claims abstract this paper presents a continuous time contingent claims framework for the traditional duration vector models of chambers et al journal of financial and quantitative analysis march 1988 89 104 prisman and shores journal of banking and finance 12 1988 493 504 and others by embedding these into the merton the bell journal of economics and management science 4 1973 141 183 stochastic interest rate option pricing model using this framework we analyze the interest rate risk characteristics of bond options and callable bonds we derive duration measures that are significantly different from the ones reported previously in the literature by garman journal of financial economics 14 1985 309 315 jamshidian and zhu advances in futures and options research 3 1988 63 95 and others the upper and lower bounds of the duration vectors of bond options and callable bonds are investigated an empirical technique based on the implied volatility methodology is suggested for the computation of the duration vectors of bond options and callable bonds

inflation and welfare in a monetary economy it is in everyone s private interest to try to get someone else to hold non interest bearing cash and reserves but someone has to hold it all so these efforts must simply cancel out all of us spend several hours per year in this effort and employ thousands of talented and highly trained people to help us these person hours are simply thrown away wasted on a task that should not have to be performed at all

the valuation of floating rate instruments abstract a framework for valuing floating rate notes is developed to examine the effects of 1 lags in the coupon formula 2 special contractual features and 3 default risk evidence from a sample of floaters indicates they sold at significant discounts while lags in the coupon formulas and other contractual features make these notes more variable they do not account for the magnitude of the discounts we conclude that the fixed default premium in the coupon formula of a typical note is inadequate to compensate for time varying default premiums demanded by investors who treat other corporate short term paper as close substitutes

prepayment and the valuation of mortgage backed securities this paper puts forward a valuation framework for mortgage backed securities rather than imposing an optimal value minimizing call condition we assume that at each point in time there exists a probability of prepaying this conditional probability depends upon the prevailing state of the economy to implement our valuation procedure we use maximum likelihood techniques to estimate a prepayment function in light of recent aggregate gnma prepayment experience by integrating this empirical prepayment function into our valuation framework we provide a complete model to value mortgagebacked securities given an optimal value minimizing call policy a mortgage should never be called when its market value is less than its call price similarly a mortgage should be called if it is worth more than its call price however mortgagors often call their loans when the prevailing refinancing rate exceeds the contract rate on the loan dunn and mcconnell 1981 in addition some mortgagors do not call their loans when the loan s contract rate exceeds the prevailing refinancing rate the purpose of this paper is to put forward a valuation framework for mortgagebacked securities consistent with these stylized facts associated with mortgage prepayments the mortgagor s prepayment decision is integral to our valuation framework however we do not impose an optimal value minimizing call condition to price these securities rather we assume that at each point in time there exists a probability of prepaying this conditional probability depending upon the prevailing state of the economy by integrating this prepayment function into our valuation framework we provide a complete model to value mortgage backed securities to implement our valuation procedures we estimate a prepayment function given recent gnma prepayment experience we follow green and shoven 1986 by using a proportional hazards model to estimate the influence of various explanatory variables or covariates on the mortgagor s prepayment decision distinct from green and shoven we explicitly model the effects of seasoning as well as investigating the influence of interest cost savings from refinancing in addition we also consider the effects of lagged refinancing rates heterogeneity

control and ownership of assets within rural ethiopian households this article investigates how the control and devolution of productive assets are allocated among husband and wife theory predicts that bargaining power within marriage depends on the division of assets upon divorce and on control over assets during marriage using detailed household data from rural ethiopia we show that assets brought to marriage ownership of assets control within marriage and disposition upon death or divorce are only partly related productive resources are controlled by the household head disposition upon death or divorce only loosely depends on individual ownership during marriage but control is associated with larger claims upon divorce assets brought into marriage have little impact on disposition upon death but matter in case of divorce

generalising interest rate duration with directional derivatives direction x and applications conventional or fisher weil duration is an ordinary derivative that measures the response of portfolio value to marginal parallel shifts in the term structure while other proposed measures are generally specific to particular interest rate processes in this paper we show that portfolio responses to arbitrary shifts in the term structure may be handled by the use of frechet or directional derivatives presenting a simple algorithm for the directional derivative of a fixed interest portfolio viewed as a set of cash flows for a given portfolio one can locate the most sensitive areas along the term structure by computing a function or profile direction x that gives the term structure movement to which the portfolio is most exposed immunisation techniques can be based on choosing ancillary assets that ensure that the portfolio directional derivative is zero or as close to zero as possible this generalises approaches based on factor models of the term structure the analysis is applied to both continuous and discrete time

duration measures immunization and utility maximization abstract this paper explores the conditions under which a risk averse investor behaves like an immunizer in choosing the maturity structure of a balance sheet the setting is similar to grove s study in that the liabilities are assumed fixed but differs in the assumed evolution of interest rates m a grove on duration and the optimal maturity structure of the balance sheet bell journal of economics and management science 5 1974 696 709 it transpires that the circumstances under which a risk averse investor behave like an immunizer are not as limited as concluded in grove s study the model thus explains the extensive use of immunization by the business community

divisia index inflation and welfare this work addresses a usual criticism in the literature of the welfare costs of inflation related to the tact that some items in the relevant definition of money pay interest while others do not we show that the problem can be solved by using a divisia index of monetary services as the welfare measure

which road leads to stable money demand this paper denies that the demand for money function is any more unstable than other demand functions and maintains that the controversies regarding unstable money demand are produce by poor methodology that is not shared by other areas of the field of economics when investigating demand function properties this abstract was borrowed from another version of this item

single factor duration models in a discrete general equilibrium framework single factor duration models sfdms for valuing debt securities have gained rapid acceptance by bond practitioners in recent years but slower acceptance by academics in large measure the slower academic acceptance reflects the lack of a rigorously developed underlying economic or financial theoretic base partially as a result some sfdms have undesirable behavioral characteristics foremost among these is that they appear to be inconsistent with accepted general equilibrium conditions this paper has two purposes the first is to construct explicitly the theoretical underpinnings of the model and the second is to develop the conditions under which the model does satisfy general equilibrium conditions this is done in sections i and ii respectively

designing an immunized portfolio is m squared the key abstract the theoretical and empirical properties of m squared a measure of cash flow dispersion used in designing duration hedged portfolios are examined contrary to prior research minimizing m squared is not independent of the stochastic process and the minimum m squared portfolio is a bullet only under a specific convexity condition derived in the paper using a data base of default free government of canada bonds to set up minimum m squared duration matching portfolios we find that the convexity property does not hold in general and that minimum m squared portfolios fail to hedge as effectively as portfolios including a bond maturing on the horizon date

continuous time methods in finance a review and an assessment i survey and assess the development of continuous time methods in finance during the last 30 years the subperiod 1969 to 1980 saw a dizzying pace of development with seminal ideas in derivatives securities pricing term structure theory asset pricing and optimal consumption and portfolio choices during the period 1981 to 1999 the theory has been extended and modified to better explain empirical regularities in various subfields of finance this latter subperiod has seen significant progress in econometric theory computational and estimation methods to test and implement continuous time models capital market frictions and bargaining issues are being increasingly incorporated in continuous time theory the roots of modern continuous time methods in finance can be traced back to the seminal contributions of merton 1969 1971 1973b in the late 1960s and early 1970s merton 1969 pioneered the use of continuous time modeling in financial economics by formulating the intertemporal consumption and portfolio choice problem of an investor in a stochastic dynamic programming setting merton 1973b also showed how such a framework can be used to develop equilibrium asset pricing implications thereby significantly extending the asset pricing theory to richer dynamic settings and expanding the scope of applications of continuous time methods to study problems in financial economics 1 within a span of about 30 years from the publication of merton s inf luential papers continuous time methods have become an integral part of financial economics indeed in certain core areas in finance such as e g asset pricing derivatives valuation term structure theory and portfolio selection continuoustime methods have proved to be the most attractive way to conduct research and gain economic intuition the continuous time approach in these areas has produced models with a rich variety of testable implications the econometric theory for testing continuous time models has made rapid strides in the last decade and has thus kept pace with the impressive progress on the theoretical front one hopes that the actual empirical investigations and estimation using the new procedures will follow suit soon

the welfare cost of inflation in canada and the united states abstract this paper follows lucas econometrica 68 2000 247 and estimates the welfare cost of inflation in the post world war ii canadian and u s economies we use recent advances in the field of applied econometrics to estimate the interest elasticity of money demand and report significantly smaller welfare costs estimates than lucas econometrica 68 2000 247

on the instability of long run money demand and the welfare cost of inflation in the united states we evaluate the policy implications of measuring the welfare cost of inflation accounting for instabilities in the long run money demand for the u s over the period 1900 2013 we extend the analysis and reassess the results reported in lucas 2000 and ireland 2009 also considering the recent theoretical contributions of lucas and nicolini 2015 and berentsen et al 2015 breaks in the long run money demand give rise to regime dependent welfare cost estimates we find that the welfare cost is about 0 1 of annual income over 1976 2013 as compared to 0 8 over 1945 1975 overall these values are substantially lower than those reported in the literature

on the welfare and cyclical implications of moderate trend inflation abstract the welfare and cyclical implications of moderate trend inflation are addressed in an augmented medium scale dsge model increasing trend inflation from 2 to 4 percent generates a consumption equivalent welfare loss of about 4 percent welfare costs of this magnitude are driven by staggered wage contracts trend growth extended borrowing a roundabout production structure and the interaction between trend inflation and shocks to the marginal efficiency of investment mei a sticky price model abstracting from these features generates much smaller losses moderate trend inflation also has important business cycle implications interacting much more strongly with mei shocks than with productivity or monetary shocks

the search for a stable money demand function a survey of the post 1973 literature phe question of whether the demnand function for money is stable is one of the most important recurring issues in the theory and application of macroeconomic policy what is being sought in a stable demand function is a set of necessary conditions for money to exert a predictable influence on the economy so that the central bank s control of the money supply can be a useful instrument of economic policy as such the notion of a stable demand function appears to involve three key elements e g john t boorman 1976 p 317 and david e w laidler 1977 pp 34 35 first the demand for money relation should be highly predictable in a statistical sense as measured by the usual goodness of fit statistics precision of estimated coefficients and presumably its ability to forecast accurately out of sample second a stable demand function for money has relatively few arguments a relationship that requires knowledge about a large number of variables in order to pin it down is in effect not predictable finally the variables that appear as arguments in the function should represent significant links to spending and economic activity in the real sector in sum a stable demand function for money means that the quantity of money is predictably related to a small set of key variables linking money to the real sector of the economy the importance of a stable money demand function for monetary policy can be illustrated with the standard is lm model in which interest rates and gnp are the endogenous variables in this context a stable demand function for money translates into a well defined relationship between money interest rates and gnp

immunization derived from a polynomial duration vector in the spanish bond market abstract this paper focuses on the spanish government debt market in an attempt to evaluate the immunization performance of the polynomial duration model of chambers and carleton chambers d r carleton w t 1988 a generalized approach to duration in chen a h ed research in finance vol 7 jai press greenwich pp 163 181 in default free and option free fixed income portfolios and to ascertain whether traditional convexity is an earnings generating element empirical tests show that three constraints namely those related to the level slope and curvature of term structure shifts are necessary to guarantee a return close to the target the only exception to this rule is found in portfolios including an asset that matures near the horizon date in which classical immunization performs properly

a contingent claims analysis of the interest rate risk characteristics of corporate liabilities abstract this paper provides a contingent claims analysis of the interest rate risk characteristics of corporate liabilities by identifying merton s 1973 option pricing model with vasicek s 1977 mean reverting term structure model only a non zero positive range of duration values for the firms assets is shown to be consistent with the previous empirical evidence on the interest rate sensitivity of corporate stocks and bonds chance s 1990 duration measure is shown to be biased downward under empirically realistic conditions theoretical conditions are derived under which the duration of a default prone zero coupon bond can be either higher or lower than the duration of the corresponding default free bond the duration of the default prone bond of a firm with high low interest rate sensitive assets is shown to be an increasing decreasing function of the bond s default risk

using linear and goal programming to immunize bond portfolios abstract bierwag and khang s 1979 model of immunizing a portfolio of default free government bonds is expanded here to include default grade corporate bonds the immunizing equation is found to be slightly different both linear and goal programming are shown to be alternative techniques for identifying an investor s optimal immunizing portfolio

floating rate notes and immunization as shown in several of those papers the appropriate immunizing duration is a function of the assumption regarding the stochastic process describing the man ner in which the term structure of interest rates changes the theory has been well developed for ordinary bonds this paper extends the existing literature on duration and immunization to a different type of security the floating rate note the floating rate note frn is a debt security in which coupon payments adjust according to changes in interest rates the coupons are closely tied to cur rent short term spot rates with the result that prices of frns are always at or near par value they became popular in this country in 1974 with a citieorp issue

female wage labor in rural zimbabwe abstract research on rural women in africa including zimbabwe has tended to emphasize women s role as farmers or food producers research conducted by the author suggests however that a significant portion of rural women including many of the poorest should not be considered as farmers at all but as wage workers while some women often aided financially by men who worked away were able to operate rural businesses and large farms many women were confined to daily paid temporary labor to meet their cash needs it is suggested that rural women do not comprise a homogenous group with identical economic and political goals nor do female headed households female only households where there was no referent male working away were notable for their poverty and lack of access to any means of agricultural production many women heading such households were casual workers with all or the bulk of their income derived from wage labor

on the welfare cost of inflation and the recent behavior of money demand post 1980 u s data trace out a stable long run money demand relationship of cagan s semi log form between the m1 income ratio and the nominal interest rate with an interest semi elasticity of 1 79 integrating under this money demand curve yields estimates of the welfare cost of modest departures from friedman s zero nominal interest rate rule for the optimum quantity of money that are quite small the results suggest that the federal reserve s current policy which generates low but still positive rates of inflation provides an adequate approximation in welfare terms to the alternative of moving all the way to the friedman rule jel e31 e41 e52

fixed versus variable rate loans this paper discusses the nature of fixed and variable loan contracts and derives the conditions which determine the optimal quantity of each the results indicate that the payoff functions are quite different and dependent upon the project financed the appropriate conditions for the allocation of loan terms to a set of borrowers are then developed finally the analysis derives the optimal portfolio frontier and risk return trade off for the banking firm here it is demonstrated that the solution is unlikely to be at a point of zero interest rate risk

off farm labour allocation decisions in small scale rural households in zimbabwe the double hurdle model is used to analyse the off farm labour decisions of small scale agricultural household members in the shamva district of zimbabwe the approach permits the joint modelling of the decision to participate in the labour market and the decision regarding the amount of time allocated to work results indicate that a number of variables notably gender education and assets indeed have effects which are qualitatively and quantitatively different in terms of participation and hours worked overall the empirical analysis confirms the importance of individual characteristics such as gender and education and household farm characteristics e g land area accessible to the household productive assets remittances and the agricultural terms of trade in influencing the labour market decisions of rural household members

hedging interest rate risk with futures portfolios under term structure effects this study develops and tests a methodology for reducing interest rate risk in a fixed spot portfolio of assets and liabilities with default free cash flows a minimum variance hedge is constructed by adding a portfolio of financial futures to the spot portfolio theorems are given which establish necessary and sufficient conditions for the existence of unique and zero variance hedges the risk reduction characteristics of the methodology are demonstrated by an empirical analysis unexpected interest rate fluctuations may have significant impact on the market value of both bond portfolios and interest sensitive institutions the early literature on this subject includes the seminal works of samuelson 27 redington 26 and wallas 29 all of whom consider the impact of unexpected interest rate changes on financial institutions briefly their results indicate that interest rate risk is minimized when the mean time of the assets and liabilities are equal assuming equal initial asset and liability values redington coined the term immunization to refer to the absence of interest rate risk the immunization solutions in their simplest form depend on the duration mean time of asset and liability cash flows the concept of duration was apparently developed independently by macaulay 22 and hicks 18 macaulay interested in the effective maturity of a bond defined duration as

the impact of credit risk on the pricing and duration of floating rate notes abstract this paper describes the pricing and duration of floating rate instruments when the borrower s credit risk has changed since the note was issued in these cases the value of the note on repricing dates equals par plus the present value of the basis point change in credit risk as a result the duration of a floater for which credit risk has increased fallen is less than greater than the time to reset and may even be negative positive correlation between credit risk and interest rates will ceteris paribus increase the duration of the floater

bank income taxes and interest rate risk management a note banks and other financial institutions are concerned with the management of their interest rate risk in the frictionless markets of most finance theory however one interest rate risk management policy is just as good as another hence the finance literature does not provide convincing reasons for managers to want to control interest rate risk consequently the literature has provided little guidance on what to control how far to go with this control or on how to explain differences in interest rate risk exposure among banks given frictionless markets shareholder indifference to the bank s interest rate risk policy plus management s preference to reduce risk could lead to policies that reduce or eliminate exposure to interest rate risk i e to immunization strategies however if part of the reason for the existence of banks is the provision of maturity intermediation services managers who avoid exposure to interest rate risk are likely to come out second best to managers who choose asset and liability portfolios that do expose the bank s shareholders to this risk in this note we develop and analyze a model of bank decisions in which tax considerations induce banks to control interest rate risk in the u s banks have many opportunities to shield current income against federal and state taxation foreign tax credits investment tax credits and investment in tax exempt securities are three examples the tax position of a bank can be thought of as a stock of nonsaleable tax shields usable in the current or in future years the tax shields are an asset and if the bank s income falls below some level then the value of that asset will be reduced either by the loss of tax shielding opportunities or by the postponement of their realization 2 this note treats the bank tax position similarly to the models discussed by brennan and schwartz 2 miller 8 deangelo and masulis 4 and kim 6 however our interest is in the effect of tax shields on risk taking by financial institutions rather than a concern with capital structure decisions 3

market power firm performance and real wage growth in zimbabwean manufacturing abstract this paper uses a two year panel of data on 600 zimbabwean manufacturing workers and the employers to examine several aspects of the labor market response to the reforms introduced in the 1991 structural adjustment program the analysis then uses this evidence to explore a number of hypotheses about the functioning of formal urban labor markets in zimbabwe with particular attention to the issue of rent sharing first as one would expect liberalization of trade did indeed act to shift employment from import competing sectors to export sectors although total manufacturing employment was basically unchanged second real wages in manufacturing fell for most workers third the pattern of wage changes across sectors and firms is consistent with a view of labor markets as noncompetitive the evidence provides support for the idea that a rent sharing process of wage determination rather than one based on efficiency wages or government intervention is an appropriate characterization of this labor market

the demand for assets and optimal monetary aggregation this paper uses a highly disaggregated demand system to estimate the degree of substitutability among monetary assets and to address the issue of optimal monetary aggregation in the united states we address the problems of dimensionality and nonlinearity estimating a very detailed monetary asset demand system encompassing the full range of assets based on the locally flexible normalized quadratic expenditure function we treat the concavity property as a maintained hypothesis and provide evidence consistent with neoclassical microeconomic theory statistical tests reject the appropriateness of the aggregation assumptions for all the money measures published by the federal reserve as well as for a large number of groupings suggested by earlier studies this supports and reinforces barnett s 2016 assertion that we should employ the broadest m4 monetary aggregate published by the center for financial stability

floating rate securities and immunization some further results this article examines the interest rate risk characteristics of a general class of floating rate securities which includes chance s securities as a special case the calculation of duration for chance s securities is zero as it should be securities in the broader class can have durations that are negative or longer than the period of time that must elapse before the payments can reflect changes in market interest rates the effect on duration of changes in the parameters of the function relating interest rate shocks to the payments and changes in the slope of the term structure are examined

on the stability of money demand abstract we show that regulatory changes that occurred in the banking sector in the early 1980s that considerably weakened regulation q can explain the apparent instability of money demand starting in the same period we evaluate the effects of the regulatory changes using a model that goes beyond aggregates as m1 and treats currency and different deposit types as alternative means of payments we use the model to construct a new monetary aggregate that performs remarkably well for all the period 1915 2012

characteristics and performance of resettlement programs a review abstract this review suggests that settlement programs are too often designed with the assumption that all settlers will succeed this has led to centralized administration and rigid designs rather than decentralized approaches flexibility in implementation support for spontaneous settlement and reliance on settlers own investment capacity collective farms have failed cropland is best allocated to individual families and their land rights must be clearly defined as ownership or long term leases farm sizes have to be flexibly adjusted to skills availability of family labor and the capital assets of the families settlers should therefore be allowed to sell or rent their land to other beneficiaries if poor settlers are to succeed settlement cannot be based solely on credit finance and provision must be made for grant elements paternalistic constraints on crop choice technology marketing or labor market participation have usually not been enforceable or have had adverse effects

welfare costs of inflation when interest bearing deposits are disregarded a calculation of the bias abstract most estimates of the welfare costs of inflation are devised considering only noninterest bearing assets ignoring that since the 1980s technological innovations and new regulations have increased the liquidity of interest bearing deposits we investigate the resulting bias sufficient and necessary conditions on its sign are presented along with closed form expressions for its magnitude two examples dealing with bidimensional bilogarithmic money demands show that disregarding interest bearing monies may lead to a non negligible overestimation of the welfare costs of inflation an intuitive explanation is that such assets may partially make up for the decreased demand of noninterest bearing assets due to higher inflation

on the markov switching welfare cost of inflation abstract this paper uses the markov switching approach to account for instabilities in the long run money demand function and compute the welfare cost of inflation in the united states in doing so it circumvents the problem of data mining of some earlier seminal contributions on these issues allowing for complicated nonlinear dynamics and sudden changes in the parameters of the money demand function moreover it extends the sample period and investigates the robustness of results to alternative money demand specifications monetary aggregation procedures and assumptions regarding dynamics aspects of the money demand specification

functional monetary aggregates monetary policy and business cycles abstract in this paper we take the economic approach to monetary aggregation in the context of highly disaggregated demand systems encompassing the full range of monetary assets in the united states we estimate the effectively globally regular minflex laurent ml and normalized quadratic nq flexible functional forms we produce the ml and nq functional monetary aggregates consistent with neoclassical microeconomic theory also addressing the issue of optimal monetary aggregation we highlight the influence of measurement on statistical inference by investigating whether the ml and nq functional monetary aggregates are of importance in resolving paradoxes associated with the measurement of money in doing so we also provide a comparison between the functional monetary aggregates and the fed s broad sum m2 aggregate and the center for financial stability broad divisia m3 and divisia m4 aggregates our detailed statistical analysis favors the functional monetary aggregates

consumer theory and the demand for money the following sections are included introductionthe definition of moneythe microeconomic theory of a monetary economythe aggregation theoretic approach to money demandindex number theorythe links between aggregation theory index number theory and monetary theoryunderstanding the new divisia aggregatesthe optimal level of monetary subaggregationeconometric considerationsapproximating the monetary services subutility functionan exampleempirical dimensionsempirical comparisons of index numbersempirical results for the demand system approachextensionsconclusions this abstract was borrowed from another version of this item