Transmission Mechanism (transmission + mechanism)

Distribution by Scientific Domains

Kinds of Transmission Mechanism

  • monetary transmission mechanism


  • Selected Abstracts


    MONETARY TRANSMISSION MECHANISM IN CENTRAL AND EASTERN EUROPE: SURVEYING THE SURVEYABLE

    JOURNAL OF ECONOMIC SURVEYS, Issue 2 2009
    Balázs Égert
    Abstract This paper surveys recent advances in empirical studies of the monetary transmission mechanism, with special attention to Central and Eastern Europe (CEE). Our results indicate that the strength of the exchange rate pass-through substantially declined over time mainly due to a fall in inflation rates and to some extent due to the so-called composition effect. The asset price channel is weak and is likely to remain weak because of shallow stock and private bond markets and because of low stock and bond holdings of domestic households. House prices may become an exception with booming mortgage lending and with high owner occupancy ratios. While the credit channel could be a powerful channel of monetary transmission , as new funds raised on capital markets are close to zero in CEE , it is actually not, as both commercial banks and non-financial corporations can escape domestic monetary conditions by borrowing from their foreign mother companies. The moderately good news, however, is that those banks and firms are influenced by monetary policy in the euro area because their parent institutions are themselves subjected to the credit channel in the euro area. [source]


    Producers' Expectations: their Role in the Monetary Transmission Mechanism

    KYKLOS INTERNATIONAL REVIEW OF SOCIAL SCIENCES, Issue 1 2000
    Tobias F. Rötheli
    This article relates to the view expressed by Pigou and Keynes that whatever factors affect the demand for goods it is ultimately producers' expectations and plans that determine the level of output. We build on this notion in order to address the question how changes in monetary policy affect output in Switzerland. For this purpose we study data on expected and actual output collected by the business cycle research center(KOF) at the Federal Institute of Technology (ETH) in Zürich. The econometric analysis documents that monetary affect output only by their impact on expectations of entrepreneurs. This finding contradicts the new classical view of the propagation of monetary shocks. [source]


    Monetary Policy, Credit and Aggregate Supply: The Evidence from Italy

    ECONOMIC NOTES, Issue 3 2002
    Riccardo Fiorentini
    This paper concerns theory and evidence of the monetary transmission mechanisms. Current research has deeply investigated factors, such as dependence of firms on bank credit, that amplify the impact of monetary policy impulses on aggregate demand exerting strong but temporary effects on output and employment. We present an intertemporal macroeconomic equilibrium model of a competitive economy where current production is financed by bank credit, and then we use it to identify supply,side effects of the credit transmission mechanism in data drawn from the Italian economy. We find evidence that the ,credit variables' identified by the model , the overnight rate as a proxy of monetary policy and a measure of credit risk , have permanent effects on employment and output by altering credit supply conditions to firms. To save on space, mathematical proofs, statistical tests and data sources have been gathered in two separate appendices that can be examined on request. (J.E.L.: E2, E5). [source]


    Oil and the Euro area economy

    ECONOMIC POLICY, Issue 60 2009
    Gert Peersman
    Summary We examine the macroeconomic effects of different types of oil shocks and the oil transmission mechanism in the Euro area. A comparison is made with the US and across individual member countries. First, we find that the underlying source of the oil price shift is crucial to determine the repercussions on the economy and the appropriate monetary policy reaction. Second, the transmission mechanism is considerably different compared to the US. In particular, inflationary effects in the US are mainly driven by a strong direct pass-through of rising energy prices and indirect effects of higher production costs. In contrast, Euro area inflation reacts sluggishly and is much more driven by second-round effects of increasing wages. The monetary policy reaction of the ECB to oil shocks is also strikingly different compared to the FED. The inflation objective, relative to the output stabilization objective, appears more important for Euro area monetary authorities than for the FED. Third, there are substantial asymmetries across member countries. These differences are due to different labour market dynamics which are further aggravated by a common monetary policy stance which does not fit all. --- Gert Peersman and Ine Van Robays [source]


    Molecular characterization of the Aedes aegypti odorant receptor gene family

    INSECT MOLECULAR BIOLOGY, Issue 5 2007
    J. Bohbot
    Abstract The olfactory-driven blood-feeding behaviour of female Aedes aegypti mosquitoes is the primary transmission mechanism by which the arboviruses causing dengue and yellow fevers affect over 40 million individuals worldwide. Bioinformatics analysis has been used to identify 131 putative odourant receptors from the A. aegypti genome that are likely to function in chemosensory perception in this mosquito. Comparison with the Anopheles gambiae olfactory subgenome demonstrates significant divergence of the odourant receptors that reflects a high degree of evolutionary activity potentially resulting from their critical roles during the mosquito life cycle. Expression analyses in the larval and adult olfactory chemosensory organs reveal that the ratio of odourant receptors to antennal glomeruli is not necessarily one to one in mosquitoes. [source]


    Increased Diversity and Deepened Uncertainty: Policy Challenges in a Zero-Inflation Economy,

    INTERNATIONAL FINANCE, Issue 3 2007
    Kiyohiko G. Nishimura
    The world economy today shows ,great diversity'. There are multiple engines of growth in various regions around the globe. Risks are diversified, as many novel financial products are being introduced and sold to a continuing flow of newcomers to the financial world. This increased diversity seems to deepen uncertainty surrounding monetary policy in two respects. First, coupled with increased competition, it may make prices less responsive to short-run demand changes than before, thus making monetary transmission mechanism less certain. In fact, Japanese IS and Phillips curves seem increasingly uncertain in the past 15 years. Second, we are in transition between one financial structure of little diversification and another of great diversification. In a transition period, information is scarce and rapidly becomes obsolete, posing real challenges to financial stability. I argue that the flexible gradualism, which the Bank has now adopted, is a prudent way to cope with such deepened uncertainty. [source]


    The Eurosystem's Operational Framework in the Context of the ECB's Monetary Policy Strategy

    INTERNATIONAL FINANCE, Issue 1 2001
    Michele Manna
    This paper discusses the implications of the European Central Bank's monetary policy strategy for the Eurosystem's operational framework, in the context of the transmission mechanism of monetary policy in the euro area. The first part of the paper uses an analytical framework common to many recent analyses of monetary policy to distinguish the operational and strategic elements of monetary policy making. The second part of the paper describes and discusses the choices made by the ECB and the Eurosystem with regard to monetary policy strategy and operational framework. In this respect, the paper highlights that the design of both these aspects of the single monetary policy reflect, in large part, the need for policy makers to retain flexibility in the face of an uncertain environment. [source]


    Interest rate transmission in the UK: a comparative analysis across financial firms and products

    INTERNATIONAL JOURNAL OF FINANCE & ECONOMICS, Issue 1 2009
    Ana-Maria Fuertes
    Abstract This paper differentiates itself from the existing literature by testing for heterogeneities in the interest rate transmission mechanism using a large sample of 662 monthly retail rate histories (1993,2004) on seven key deposit and loan products. Error correction models are estimated to analyse the long-run pass-through, the long-run mark-up and the short-run speed of adjustment. The prediction that the official and retail rates move together in the long run is supported by the data. The evidence suggests weak between-product heterogeneity but notable differences were found between financial firms in the way they adjust their rates, which could hinder the achievement of monetary policy objectives. Consumer responses to official rate changes could therefore be more phased and intricate than hitherto believed. Heterogeneity in adjustment is found to be linked to menu costs and key financial ratios under managerial control. Copyright © 2008 John Wiley & Sons, Ltd. [source]


    Volatility of changes in G-5 exchange rates and its market transmission mechanism

    INTERNATIONAL JOURNAL OF FINANCE & ECONOMICS, Issue 1 2002
    Bwo-Nung Huang
    Abstract This paper studies the transmission mechanism of G-5 exchange rate changes within each market and across the three major markets: London, New York and Tokyo. It is found that the volatility in both the London and New York markets leads that of Tokyo. In addition, the New York market slightly leads the London market in its volatility. After the Euro monetary system crisis, the frequencies of both the volatility spillover effect from London to New York and mutual feedback phenomena have increased. Furthermore, the volatility spillover effects from both London and New York to Tokyo have been on the rise after the Asian financial debacle. Within the framework of the causality model, we find better forecasting performance in predicting G-5 exchange rates across the three markets. It outperforms the traditional ARMA model in terms of both in- and out-sample forecasting. Copyright © 2002 John Wiley & Sons, Ltd. [source]


    MONETARY TRANSMISSION MECHANISM IN CENTRAL AND EASTERN EUROPE: SURVEYING THE SURVEYABLE

    JOURNAL OF ECONOMIC SURVEYS, Issue 2 2009
    Balázs Égert
    Abstract This paper surveys recent advances in empirical studies of the monetary transmission mechanism, with special attention to Central and Eastern Europe (CEE). Our results indicate that the strength of the exchange rate pass-through substantially declined over time mainly due to a fall in inflation rates and to some extent due to the so-called composition effect. The asset price channel is weak and is likely to remain weak because of shallow stock and private bond markets and because of low stock and bond holdings of domestic households. House prices may become an exception with booming mortgage lending and with high owner occupancy ratios. While the credit channel could be a powerful channel of monetary transmission , as new funds raised on capital markets are close to zero in CEE , it is actually not, as both commercial banks and non-financial corporations can escape domestic monetary conditions by borrowing from their foreign mother companies. The moderately good news, however, is that those banks and firms are influenced by monetary policy in the euro area because their parent institutions are themselves subjected to the credit channel in the euro area. [source]


    MONETARY POLICY AND BEHAVIOURAL FINANCE

    JOURNAL OF ECONOMIC SURVEYS, Issue 5 2007
    K. Cuthbertson
    Abstract There have been major advances in both theory and econometric techniques in mainstream macro-models and parallel advances in knowledge of the monetary transmission mechanism acting via asset prices. At the same time, behavioural finance has provided evidence that not all actors in the economy are ,fully rational' and this has influenced models of asset pricing on which part of the monetary policy transmission mechanism depends. Such uncertainty about the behaviour of asset prices has in part stimulated a move towards ,robustness', as an important criterion for guiding monetary policy. We argue that although we have discovered much, including ,what not to do', nevertheless our knowledge of the transmission mechanism is very incomplete. This is because, in spite of all the theoretical advances that have been made, there is still considerable uncertainty over the behaviour of agents, which has been reinforced by insights from behavioural finance. [source]


    New Keynesian Macroeconomics and the Term Structure

    JOURNAL OF MONEY, CREDIT AND BANKING, Issue 1 2010
    GEERT BEKAERT
    monetary policy; inflation target; term structure of interest rates; Phillips curve This article complements the structural New Keynesian macro framework with a no-arbitrage affine term structure model. Whereas our methodology is general, we focus on an extended macro model with unobservable processes for the inflation target and the natural rate of output that are filtered from macro and term structure data. We find that term structure information helps generate large and significant parameters governing the monetary policy transmission mechanism. Our model also delivers strong contemporaneous responses of the entire term structure to various macroeconomic shocks. The inflation target shock dominates the variation in the "level factor" whereas monetary policy shocks dominate the variation in the "slope and curvature factors." [source]


    The Role of Interbank Markets in Monetary Policy: A Model with Rationing

    JOURNAL OF MONEY, CREDIT AND BANKING, Issue 6 2008
    XAVIER FREIXAS
    banking; rationing; monetary policy This paper analyzes the impact of asymmetric information in the interbank market and establishes its crucial role in the microfoundations of the monetary policy transmission mechanism. We show that interbank market imperfections induce an equilibrium with rationing in the credit market. This has two major implications: first, it reconciles the irresponsiveness of business investment to the user cost of capital with the large impact of monetary policy (magnitude effect), and second, it shows that banks' liquidity positions condition their reaction to monetary policy (Kashyap and Stein liquidity effect). [source]


    Effects Of Topically Applied Capsaicin Cream On Neurogenic Inflammation And Thermal Sensitivity In Rats

    JOURNAL OF THE PERIPHERAL NERVOUS SYSTEM, Issue 2 2000
    M. Yoshimura
    The effects of capsaicin cream on neurogenic inflammation and thermal nociceptive threshold were investigated in rats. Firstly, for topical application of capsaicin cream to hind paw, we shaped boots from dental cement to prevent the animals from licking off the drug. Capsaicin cream (1%) led to significant increases in the amounts of Evans blue and substance P (SP) released into the perfusate, and the former response was significantly suppressed by pretreatment with RP67580, an NK1-receptor antagonist, but not by treatment with an NK2-receptor antagonist. Subsequent electrical stimulation of the sciatic nerve resulted in a significant reduction in Evans blue and SP extravasation 24 h after topical application of capsaicin cream. On the other hand, when capsaicin cream was repeatedly applied to both hind paws once a day, withdrawal latency for noxious heat stimulation decreased after 24 h, and this thermal hyperalgesia was reversed 3 days later. These results suggest that capsaicin cream initially affects neurogenic inflammation mechanisms and then blocks the pain transmission mechanism. [source]


    ENTRY AND EXIT OF LABOR AND CAPITAL IN A FISHERY

    NATURAL RESOURCE MODELING, Issue 2 2005
    ASGEIR DANIELSSON
    ABSTRACT. Exit and entry of fishermen, as well as vessels, is modeled explicitly. If the speed of exit and entry of fishermen is less than instantaneous the wage rate varies with the fortunes of the fishing firms and affects the endogenous labor supply creating a second transmission mechanism from profits to effort. There are realistic cases where this mechanism has important effects on the stability of the dynamic system and on the effects of taxes (subsisdies) on the size of the fish stock. If labor supply depends negatively on the wage rate, the immediate effect of an increase in the tax rate is to increase effort and harvest. This condition makes it also more probable that the dynamic system is unstable. In those cases where the dynamic system is unstable the increase in the tax rate increases overexploitation not only in the short-term but also in the long-term. [source]


    CAN TUNISIA MOVE TO INFLATION TARGETING?

    THE DEVELOPING ECONOMIES, Issue 1 2007
    Adel BOUGHRARA
    E47; E52; E58 Inflation targeting has become an alternative monetary strategy that has been followed by many industrial and emerging countries. This study considers whether the adoption of inflation targeting would be relevant for Tunisia. More specifically, this paper aims at checking whether the necessary conditions for the successful implementation of such a strategy are fulfilled or not. It is found that fiscal dominance does not constitute the main hindrance to the adoption of inflation targeting. Other impediments have been identified, especially a weak financial system in general, the unsound and fragile banking system in particular, and the glaring lack of knowledge about the monetary transmission mechanism. Furthermore, it has been pointed out that if Tunisian monetary authorities continue to carry out the present exchange rate regime, namely, the constant real exchange rate rule, an inflation targeting regime will not be sufficient to properly contain the inflation pressures caused by demand shocks. [source]


    Exchange Rates and Monetary Policy

    AUSTRALIAN ECONOMIC PAPERS, Issue 4 2002
    Vítor Gaspar
    This paper looks at the relation between exchange rates and monetary policy. It focuses in particular on the role of the exchange rate of the euro in the context of the ECB's monetary policy strategy. The objective of monetary policy is to maintain price stability. The euro area is a large and relatively closed economy. Therefore, the exchange rate of the euro is not an intermediate target nor is it an objective. Nevertheless, the ECB's stability,oriented monetary policy strategy does not neglect the exchange rate of the euro. Clearly, exchange rate developments are taken into account both when looking at the transmission mechanism of monetary policy and when assessing the current economic situation and prospects for the euro area. [source]


    Bank loan portfolios and the Canadian monetary transmission mechanism

    CANADIAN JOURNAL OF ECONOMICS, Issue 3 2009
    Wouter J. Den Haan
    Abstract Following a monetary tightening, bank loans to consumers decrease. This is true for both mortgage and non-mortgage loans, and it is true for a tightening by the Bank of Canada that is, and is not, a response to a tightening by the Federal Reserve System. In contrast, business loans increase following a monetary tightening. The ,perverse' response of business loans cannot be explained by an increase in the demand for funds due to a reduction in real activity. These results are consistent with a change in bank portfolio behaviour in favour of business loans in response to a monetary tightening. A la suite d'une restriction monétaire, les prêts bancaires aux consommateurs chutent. C'est vrai tant pour les prêts hypothécaires que non-hypothécaires, et c'est vrai pour une restriction monétaire de la Banque du Canada, qu'elle soit ou non le résultat d'une restriction de la Réserve Fédérale américaine. A l'inverse, les prêts bancaires aux entreprises s'accroissent suite à une restriction monétaire. Cette réponse ,perverse' des prêts aux entreprises ne peut pas s'expliquer par un accroissement de la demande de fonds attribuable à un déclin de l'activitééconomique. Ces résultats sont consistants avec un changement du comportement des banques qui déplacent leurs portefeuilles de prêts en faveur des entreporises quand il y a restriction monétaire. [source]


    Credit market imperfections and exchange rate variability

    CANADIAN JOURNAL OF ECONOMICS, Issue 2 2000
    Wai-Ming Ho
    In this paper a two-country overlapping generations model is presented in which the roles of financial factors in the international monetary transmission mechanism are studied and whether and how the two types of credit market imperfections, limited participation, and costly state verification may contribute to the high variability of exchange rates are examined. Liquidity effects generated by monetary disturbances are shown to have qualitatively similar effects on the world economy in the perfect information case and in the costly information case. However, quantitative differences provide dfferent predictions about the variability of economic variables in the world economy. JEL Classification: F31, F41 Ce mémoire présente un modèle de deux pays où les générations se chevauchent pour étudier le rôle des facteurs financiers dans le mécanisme de transmission monétaire international, et pour examiner si les deux types d'imperfection (participation limitée et contrôle étatique coûteux) peuvent contribuer à une grande variabilité des taux de change et de quelle manière. On montre que les effets de liquidité engendrés par les perturbations monétaires ont les mêmes effets qualitatifs sur l'économie mondiale que l'information soit parfaite ou coûteuse. Cependant, il y a des différences quantitatives. Ces différences suggèrent des écarts dans les prévisions quant à la variabilité des variables économiques dans l'économie mondiale. [source]


    Monetary Policy, Credit and Aggregate Supply: The Evidence from Italy

    ECONOMIC NOTES, Issue 3 2002
    Riccardo Fiorentini
    This paper concerns theory and evidence of the monetary transmission mechanisms. Current research has deeply investigated factors, such as dependence of firms on bank credit, that amplify the impact of monetary policy impulses on aggregate demand exerting strong but temporary effects on output and employment. We present an intertemporal macroeconomic equilibrium model of a competitive economy where current production is financed by bank credit, and then we use it to identify supply,side effects of the credit transmission mechanism in data drawn from the Italian economy. We find evidence that the ,credit variables' identified by the model , the overnight rate as a proxy of monetary policy and a measure of credit risk , have permanent effects on employment and output by altering credit supply conditions to firms. To save on space, mathematical proofs, statistical tests and data sources have been gathered in two separate appendices that can be examined on request. (J.E.L.: E2, E5). [source]


    Contagion Phenomena in Financial Crises: Evidence from the Portuguese and Spanish Exchange Rate Crises in the Early 1990s

    INTERNATIONAL FINANCE, Issue 2 2003
    Margarida AbreuArticle first published online: 3 SEP 200
    Based on the experience of the Portuguese and Spanish financial crises in the early 1990s, this paper suggests that the spillover of exchange rate crises may reveal a particular dimension of the financial contagion effect: the presumption of mimetic behaviour by monetary authorities. This paper analyses the evolution of the credibility of the Escudo and the Peseta. We set out to test the existence of a contagion effect: that is, in what way does the polarization of exchange rate expectations in a scenario of devaluation of one currency explain the building up of a similar scenario for the other currency? We also examine the transmission mechanisms of such a scenario. Our results suggest the existence of a one-way contagion effect, of the Escudo by the Peseta. Speculative attacks against the Peseta necessarily give rise to speculative attacks against the Escudo, regardless of the evolution of the ,fundamentals' of the Escudo. In this case, the spillover of financial crises could be better understood by the anticipated mimetic behaviour of monetary authorities, rather than by the geographical proximity of the countries in question or by the identical performance of the economies of both. [source]


    Teamworking and organizational performance: A review of survey-based research

    INTERNATIONAL JOURNAL OF MANAGEMENT REVIEWS, Issue 2 2008
    Anne Delarue
    This paper presents a review of recent survey-based research looking at the contribution of teamwork to organizational performance. In particular, it focuses on empirical studies in which both teamwork and performance are directly measured in a quantitative way. The paper begins by identifying four interrelated dimensions of teamwork effectiveness: attitudinal, behavioural, operational and financial. The first two represent transmission mechanisms by which organizational performance can be improved. The latter two provide direct measures of organizational outcomes. The review shows that teamworking has a positive impact on all four dimensions of performance. It also reveals that, when teamwork is combined with structural change, performance can be further enhanced. The paper concludes by highlighting some important research gaps that future studies could address. [source]


    A preliminary examination of the intergenerational continuity of maternal psychopathic features

    AGGRESSIVE BEHAVIOR, Issue 1 2007
    Bryan R. Loney
    Abstract The study provided a preliminary test of the intergenerational continuity of maternal psychopathic features in a non-referred elementary aged sample of children. Consistent with dominant etiological models and recent behavioral genetics research, a direct association was expected between maternal and child affective features of psychopathy (i.e., callous,unemotional or CU traits). Potential mediators representative of alternative transmission mechanisms were assessed including parenting dysfunction, parental hostility/interpersonal insensitivity, and child impulsivity. Behavioral features of psychopathy were also assessed and were predicted to bear weaker and more indirect parent,child associations. A mixed sex sample of 83 children accompanied by a biological mother were administered a multi-informant rating-scale battery including separate parent (i.e., Levenson Self-Report Psychopathy Scale) and child (i.e., Antisocial Process Screening Device) measures of psychopathy. Consistent with prediction, a significant association was documented between maternal and child CU traits (r=.22). Additionally, a slightly weaker association and statistical trend (r=.21) was observed in the relation between maternal and child interpersonal features of the psychopathy construct. Contrary to prediction, all documented associations were fully mediated by parental hostility and parenting dysfunction. Given the preliminary nature of study findings, implications for developmental modeling and future intergenerational continuity research are discussed. Aggr. Behav. 33:14,25, 2007. © 2006 Wiley-Liss; Inc. [source]


    Does inequality cause conflict?

    JOURNAL OF INTERNATIONAL DEVELOPMENT, Issue 4 2003
    Christopher Cramer
    This paper suggests that economic inequality is important to explaining civil conflict, but that the links are not as direct as is often supposed. It is important to focus on the variety of ways in which inequalities are managed by societies, and the significance of varying kinds of inequality. It is also important to understand the transmission mechanisms that enable a relatively peaceable durable inequality to turn into a violent conflict. These considerations, together with the poor quality of the available inequality data, should make us more cautious about the conclusions reached by cross-country empirical studies into the causes of conflict which ascribe a strong predictive power to measures of inequality. Copyright © 2003 John Wiley & Sons, Ltd. [source]


    Non-empirical calculations of NMR indirect carbon,carbon coupling constants.

    MAGNETIC RESONANCE IN CHEMISTRY, Issue 8 2004
    Monocycloalkanes, Part
    Abstract Carbon,carbon and carbon,hydrogen spin,spin coupling constants were calculated in the series of the first six monocycloalkanes using SOPPA and SOPPA(CCSD) methods, and very good agreement with the available experimental data was achieved, with the latter method showing slightly better results in most cases, at least in those involving calculations of J(C,C). Benchmark calculations of all possible 21 coupling constants J(C,C), J(C,H) and J(H,H) in chair cyclohexane revealed the importance of using the appropriate level of theory and adequate quality of the basis sets. Many unknown couplings in this series were predicted with high confidence and several interesting structural trends (hybridization effects, multipath coupling transmission mechanisms, hyperconjugative interactions) were elucidated and are discussed based on the present calculations of spin,spin couplings. Copyright © 2004 John Wiley & Sons, Ltd. [source]


    Non-empirical calculations of NMR indirect carbon,carbon coupling constants.

    MAGNETIC RESONANCE IN CHEMISTRY, Issue 6 2003
    Part 4: Bicycloalkanes
    Abstract A systematic study of the one-bond and long-range J(C,C), J(C,H) and J(H,H) in the series of nine bicycloalkanes was performed at the SOPPA level with special emphasis on the coupling transmission mechanisms at bridgeheads. Many unknown couplings were predicted with high reliability. Further refinement of SOPPA computational scheme adjusted for better performance was carried out using bicyclo[1.1.1]pentane as a benchmark to investigate the influence of geometry, basis set and electronic correlation. The calculations performed demonstrated that classical ab initio SOPPA applied with the locally dense Dunning's sets augmented with inner core s-functions used for coupled carbons and Sauer's sets augmented with tight s-functions used for coupled hydrogens performs perfectly well in reproducing experimental values of different types of coupling constants (the estimated reliability is ca 1,2 Hz) in relatively large organic molecules of up to 11 carbon atoms. Additive coupling increments were derived for J(C,C), J(C,H) and J(H,H) based on the calculated values of coupling constants within SOPPA in the model bicycloalkanes, in reasonably good agreement with the known values obtained earlier on pure empirical grounds. Most of the bridgehead couplings in all but one bicycloalkane appeared to be essentially additive within ca 2,3 Hz while bicyclo[1.1.1]pentane demonstrated dramatic non-additivity of ,14.5 Hz for J(C,C), +16.6 Hz for J(H,H) and ,5.5 Hz for J(C,H), in line with previous findings. Non-additivity effects in the latter compound established at the SOPPA level should be attributed to the through-space non-bonded interactions at bridgeheads due to the essential overlapping of the bridgehead rear lobes which provides an additional and effective non-bonding coupling path for the bridgehead carbons and their protons in the bicyclopentane framework. Copyright © 2003 John Wiley & Sons, Ltd. [source]