explaining the border effect the role of exchange rate variability shipping costs and geography this paper exploits a three dimensional panel data set of prices on 27 traded goods over 88 quarters across 96 cities in the us and japan we show that a simple average of good level real exchange rates tracks the nominal exchange rate well suggesting strong evidence of sticky prices focusing on dispersion in prices between city pairs we find that crossing the us japan border is equivalent to adding as much as 43 000 trillion miles to the cross country volatility of relative prices we turn next to economic explanations for this so called border effect and to its dynamics distance unit shipping costs and exchange rate variability collectively explain a substantial portion of the observed international market segmentation relative wage variability on the other hand has little independent impact on segmentation 2001 elsevier science b v all rights reserved

learning about a new technology pineapple in ghana this paper investigates the role of social learning in the diffusion of a new agri cultural technology in ghana we use unique data on farmers communication patterns to define each individual s information neighborhood conditional on many potentially confounding variables we find evidence that farmers adjust their inputs to align with those of their information neighbors who were surpris ingly successful in previous periods the relationship of these input adjustments to experience further indicates the presence of social learning in addition applying the same method to input choices for another crop of known technol ogy correctly indicates an absence of social learning effects jel d83 013 033 q16

territorial innovation models a critical survey moulaert f and sekia f 2003 territorial innovation models a critical survey reg studies 37 289 302 this paper provides a critical review of the literature on territorial innovation models industrial districts milieux innovateurs new industrial spaces local production systems etc the review is organized in two stages first the main features of each of these models and their view of innovation are compared second their theoretical building blocks are reconstructed and evaluated from the point of view of conceptual clarity and analytical coherence it is found that despite some semantic unity among the concepts used economies of agglomeration endogenous development systems of innovation evolution and learning network organization and governance territorial innovation models tims suffer from conceptual ambiguity the latter is mainly a consequence of the way territorial innovation is theorized i e in terms of technologically driven innovation and a business culture that is ma

pension plan characteristics and framing effects in employee savings behavior abstract defined contribution pensions in many postsecondary institutions are funded by a combination of an employer premium and a mandatory employee premium individuals can also contribute to a supplemental savings account holding constant total compensation standard reasoning suggests that supplemental savings should depend negatively on the sum of the employer and employee pension contributions contrarily we find that the supplementary savings of professors are significantly more sensitive to employee contributions than to employer contributions this asymmetry is consistent with different marginal propensities to save out of the salary and pension components of compensation nevertheless impacts on lifetime utility are relatively modest

demographic changes financial markets and the economy using a large sample of countries and 60 years of data the authors found a strong and intuitive link between demographic transitions and both gdp growth and capital market returns unlike previous researchers who used ad hoc and restrictive demographic variables the authors imposed a smooth and parsimonious polynomial curve across all age groups they also performed robustness checks and produced forecasts for the coming decade with all the necessary caveats view a webinar of this article

withdrawal location with progressive tax rates optimal withdrawal strategies are developed for retirees with multiple types of tax advantaged savings accounts in an environment of progressive tax rates the ability to convert pretax funds in traditional iras at low tax rates substantially increases investors residual accumulations and withdrawal sustainability specifically informed withdrawal location strategies in which traditional ira distributions can be applied against exemptions deductions and lightly taxed tax brackets can increase residual accumulations by more than 1 million in these strategies the optimal tax bracket through which an investor should take distributions is directly related to the investor s wealth level

determinants of environmental investments testing the structural model abstract the main purpose of this study is to provide the needed additional quantitative evidence regarding the introduction of environmental technologies and to increase the possibility for generalization and thus policy application of conclusions to achieve that purpose a conceptual model is developed and then tested on a large database of firms from various industries with the use of structural equation modeling the results show that policy measures past environmental investments the importance of environmental technologies for customers and the firm performance have a positive effect on environmental investments furthermore the results show that policy measures are a second order three factor construct

relationships and traders in madagascar this article documents the role that personal relationships play in economic exchange original survey data show that agricultural traders in madagascar perceive relationships as the most important factor for success in their business evidence details the extent to which relationships are used to serve a variety of purposes such as the circulation of information about prices and market conditions the provision of trade credit the prevention and handling of contractual difficulties the regularity of trade flows and the mitigation of risk of these the regularity of supply and demand and the sharing of risk appear particularly important larger and more prosperous traders are those with quantitatively and qualitatively better relationships family plays little role in business beyond assistance at start up

does front loading taxation increase savings evidence from roth 401 k introductions can governments increase private savings by taxing savings up front instead of in retirement roth 401 k contributions are not tax deductible in the contribution year but withdrawals in retirement are untaxed the more common before tax 401 k contribution is tax deductible in the contribution year but both principal and investment earnings are taxed upon withdrawal using administrative data from eleven companies that added a roth contribution option to their existing 401 k plan between 2006 and 2010 we find no evidence that total 401 k contribution rates differ between employees hired before versus after the roth introduction which means that the amount of retirement consumption being purchased by 401 k contributions increases after the roth introduction a survey experiment suggests two behavioral factors play a role in the unresponsiveness of contribution rates to their tax treatment 1 employee confusion about or neglect of the tax properties of roth balances and 2 partition dependence

exploring the dynamics of water innovation foundations for water innovation studies the urgent need for innovation to address multifaceted and intertwined water related challenges is becoming increasingly clear acknowledged and responded to with cumulating sources and amounts of funding nevertheless the water sector has been claimed to be less innovative than other sectors this special volume on the dynamics of water innovation is based on the realization that in general there is a striking absence of academic studies on the dynamics of water innovation this sv is therefore designed to lay the foundations for the field of water innovation studies in an effort to integrate the emerging insights together the contributions in this sv capture the current understanding of the dynamics of water innovation and provide insights into how the water innovation process can be fostered the purpose of this introductory article is threefold namely to frame the discussion on water innovation dynamics in order to contextualise the contributions of this sv to provide systematic guidance for studying water innovation dynamics and to suggest the way forward for water innovation studies it captures the extent of the field of water innovation studies with a review of the literature of the last three decades and frames water innovations based on five decades of innovation research and drawing on three areas management strategy and policy we provide an innovation studies taxonomy that consists of four organising dimensions type of innovation stage of innovation level of analysis and measurement this taxonomy enables researchers to study the dynamics of water innovation from different combinations of conceptual and thematic angles drawing on the field of innovation studies in a systematic fashion finally we reflect on the way forward for water innovation studies with suggestions for future research 2017 the authors

the governance of sustainable socio technical transitions a quasi evolutionary model of socio technical transitions is described in which regimes face selection pressures continuously differentiated transition contexts determine the form and direction of regime change in response to these pressures the articulation of pressures and the degree to which responses are coordinated and based on resources available within the regime define the transition context four alternative contexts are described endogenous renewal re orientation of trajectories emergent transformation and purposive transitions agency and power in the governance of regime transformation are analysed power to affect change depends on regime membership the distribution of resources for change and expectations

taxable and tax deferred investing a tax arbitrage approach we analyze an intertemporal portfolio problem with both taxable and tax deferred retirement accounts using a tax arbitrage argument we identify conditions under which the optimal location decision where to place an asset is separable from the allocation decision how much to allocate to each asset investors place highly taxed assets in the tax deferred account to maximize the tax benefit and adjust their taxable portfolios to achieve the optimal risk exposure we show that the two account problem can be reduced to a taxable account only problem the results are robust to capital gains tax deferrals consumption and contribution decisions and stochastic tax rates

sustainable production and consumption systems cooperation for change assessing and simulating the willingness of the firm to adopt develop cleaner technologies the case of the in bond industry in northern mexico abstract over the last decade literature on the greening of industry and environmental policy has provided numerous important insights into the determinants of the firm s innovative behaviour in cleaner technologies however this literature still lacks empirically tested theoretical models this paper contributes to fill this gap proposing a definitional system that enables the testing of hypotheses of dependence between willingness to innovate in cleaner technologies and its determinants and to explore the conditions under which the firms innovative behaviour could be fostered regression and simulation outcomes indicate against the general wisdom that stringent environmental regulation without consideration to the dynamics of technical change and environmental and economic risk perceptions in the part of firms would play against the promotion of innovation in cleaner production

retirement security in an aging population abstract elderly individuals exhibit wide disparities in their sources of income for those in the bottom half of the income distribution social security is the most important source of support program changes would directly affect their well being income from private pensions assets and earnings are relatively more important for higher income elderly individuals who have more diverse income sources the trend from private sector defined benefit to defined contribution pension plans has shifted responsibility for retirement security to individuals a significant subset of the population is unlikely to be able to sustain their standard of living in retirement without higher pre retirement saving

are americans saving optimally for retirement we solve each household s optimal saving decisions using a life cycle model that incorporates uncertain lifetimes uninsurable earnings and medical expenses progressive taxation government transfers and pension and social security benefits with optimal decision rules we compare household by household wealth predictions from the life cycle model using a nationally representative sample we find making use of household specific earnings histories that the model accounts for more than 80 percent of the 1992 cross sectional variation in wealth fewer than 20 percent of households have less wealth than their optimal targets and the wealth deficit of those who are undersaving is generally small

the economic importance of financial literacy theory and evidence this paper undertakes an assessment of a rapidly growing body of economic research on financial literacy we start with an overview of theoretical research which casts financial knowledge as a form of investment in human capital endogenizing financial knowledge has important implications for welfare as well as policies intended to enhance levels of financial knowledge in the larger population next we draw on recent surveys to establish how much or how little people know and identify the least financially savvy population subgroups this is followed by an examination of the impact of financial literacy on economic decision making in the united states and elsewhere while the literature is still young conclusions may be drawn about the effects and consequences of financial illiteracy and what works to remedy these gaps a final section offers thoughts on what remains to be learned if researchers are to better inform theoretical and empirical models as well as public policy jel a20 d14 g11 i20 j26

correction the composition and drawdown of wealth in retirement in extending our research on issues related to those in this paper we have discovered an error in our calculations of the expected present discounted value of life contingent payout streams in our paper the composition and drawdown of wealth in retirement published in the fall 2011 issue of this journal this error affected entries in tables 1 and 2 of the paper and the associated discussion the error overstated the wealth equivalent value of both social security and defi ned benefi t pensions the corrected values shown in the tables below indicate that the average capitalized value of social security for all retirementage households is 204 264 rather than 341 556 the mean capitalized value of defi ned benefi t pension payouts is 99 147 taken together social security and defi ned benefi t pension wealth represent 34 9 percent of the mean value of household wealth not 46 percent as initially reported the share of home equity which was previously reported as 16 8 percent correspondingly rises to 20 2 percent and

defined contribution plans defined benefit plans and the accumulation of retirement wealth abstract the private pension structure in the united states once dominated by defined benefit db plans is currently divided between defined contribution dc and db plans wealth accumulation in dc plans depends on a participant s contribution behavior and on financial market returns while accumulation in db plans is sensitive to a participant s labor market experience and to plan parameters this paper simulates the distribution of retirement wealth under representative db and dc plans it uses data from the health and retirement study hrs to explore how asset returns earnings histories and retirement plan characteristics contribute to the variation in retirement wealth outcomes we simulate dc plan accumulation by randomly assigning individuals a share of wages that they and their employer contribute to the plan we consider several possible asset allocation strategies with asset returns drawn from the historical return distribution our db plan simulations draw earnings histories from the hrs and randomly assign each individual a pension plan drawn from a sample of large private and public defined benefit plans the simulations yield distributions of both dc and db wealth at retirement average retirement wealth accruals under current dc plans exceed average accruals under private sector db plans although dc plans are also more likely to generate very low retirement wealth outcomes the comparison of current dc plans with more generous public sector db plans is less definitive because public sector db plans are more generous on average than their private sector db counterparts

the diffusion of clean technologies a review with suggestions for future diffusion analysis abstract this article gives an overview of the literature on clean technology diffusion followed by suggestions for future analysis findings from diffusion analysis are presented in the form of 10 stylised facts helping the reader to see the forest for the trees the overall conclusion is that the diffusion of clean technology same as the diffusion of normal innovations is governed by endogenous mechanism epidemic learning and learning economies and by exogenous mechanisms policy is important for clean technology diffusion but other factors are important too the characteristics of the clean technology absorptive capacities of potential adopters and the age structure of capital it is often overlooked that companies have a choice they can choose between an end of pipe solution a process change adaptation and a change of process substitution this means that the diffusion and evolution of one clean technology will be at the expense of the diffusion of another clean technology something overlooked in studies on clean technology diffusion further research is needed on the influence of public policy on clean technology choice expectations about learning economies and prices adjustment costs network externalities and complementary innovations on clean technology adoption choices

the water utility adoption model wuam understanding influences of organisational and procedural innovation in a uk water utility for uk water and sewerage companies wascs the capacity to innovate capital investment processes and consequently performance outcomes is fundamental as they seek to deliberately change infrastructure to improve the sustainability of service delivery within a comparatively regulated framework innovation is viewed here as being either incremental or radical changes to the products services and processes ways of delivering services which are typical to the organisation wascs product and process innovations may involve changes to some or all of technologies organisational structure and processes behaviour and culture and knowledge and skills within the organisation and its supply chain this paper sets out to provide an understanding of the factors which both enable and constrain the development and adoption of infrastructure investment process innovations in the context of water utilities concerned with water and sewerage service delivery the paper documents the process and results from an inductive research programme of participatory action research undertaken within a large privately owned uk wasc to facilitate infrastructure investment process innovation employee narratives during the innovation process from initiation to adoption decision making were characterised and analysed the findings suggest that the development and adoption of asset investment process innovations tends to be skewed in favour of opportunities which align with i uk and european union legislative and regulatory drivers ii wasc mission policy and goals iii innovation cost advantages over a prescribed period of time iv perceived risks to service provision associated with the introduction of the innovation and v the extent to which the organisational processes and cultures which act to increase the absorptive capacity of the wasc to the proposed innovation are already functioning

general wisdom concerning the factors affecting the adoption of cleaner technologies a survey 1990 2007 abstract cleaner technologies ct have recently received much attention in diverse media and policy agendas this comes out of the clear role they play in environmental protection and sustainability and the large potential to contribute to economic growth and competitiveness the realization of both potentials depends on the level diffusion and exploitation achieved today very low this article presents a selective survey of papers that today represent the general wisdom concerning the factors affecting adoption as a primary condition to diffusion and exploitation of ct the paper helps to clarify the challenges facing diffusion modelers and policy makers when dealing with policy design assessing the levels of diffusion achieved as well as the factors affecting diffusion of a particular technology the paper ends outlining further research need in the field

when saving is gambling abstract prize linked savings pls accounts which allocate interest using lottery payments rather than fixed interest encourage savings by appealing to households gambling preferences i introduce new data on casino cash withdrawals to measure gambling and examine how individual gambling expenditures respond to the introduction of pls in nebraska using a difference in differences design after pls is introduced individuals who live in counties that offer pls reduce gambling by at least 3 more than unaffected individuals the substitution effect is stronger in low frills gambling environments which most resemble pls indicating that these accounts fulfill the desire to gamble

empirical age earnings profiles the human capital earnings function in which earnings are expressed as a quadratic in potential experience is probably the most widely accepted empirical specification in economics in spite of its widespread acceptance the human capital earnings function provides a very poor approximation of the true empirical relationship between earnings and experience the standard formulation understates early career earnings growth by about 30 50 and overstates midcareer growth by 20 50 however simple alternative specifications that fit the data are available

the tradeoff between mortgage prepayments and tax deferred retirement savings abstract many households face the tradeoff between paying an extra dollar off the remaining mortgage on their house and saving that extra dollar in tax deferred accounts tdas used for retirement we show that under certain conditions it becomes a tax arbitrage to reduce mortgage prepayments and to increase tda contributions because of the tax deductibility of mortgage interest and tax exemption of qualified retirement savings using data from the survey of consumer finances we document that a significant number of households that are accelerating their mortgage payments instead of saving in tdas forgo a profitable tax arbitrage opportunity finally we show empirically that this inefficient behavior is unlikely to be driven by liquidity or other financial constraints rather the observed behavior can be attributed to a certain extent to the reluctance of many households to participate in financial markets as either lenders or borrowers

are stocks desirable in tax deferred accounts abstract existing literature suggests that in order to maximize the tax benefit of retirement accounts investors should follow a pecking order location rule of placing highly taxed assets e g bonds in a tax deferred account and lightly taxed assets e g stocks in a taxable account empirical evidence however documents that a large number of investors violate this rule in this paper we show that such violations can be optimal for risk averse investors who face portfolio constraints in particular while the strategy of placing bonds in the tax deferred account maximizes the expected level of tax benefit it may lead to volatile benefits under different realizations of stock returns by holding a similar portfolio in both accounts investors can achieve a more balanced growth in the two accounts minimize the likelihood of violating the constraints in the future and hence smooth the volatility of the tax benefit for some risk averse investors this smoothing motive can lead to the observed violation of the pecking order location rule our model predicts that such violations are more likely when future tax benefits are more volatile which can occur for example when i the tax rate differential across assets increases over time due either to tax law changes or to tax bracket changes for investors ii asset returns are more volatile and iii investors anticipate large future liquidity needs

the growing gap in life expectancy using the future elderly model to estimate implications for social security and medicare across the industrialized world health and mortality gradients by education and income have generally been steepening crimmins and saito 2001 meara richards and cutler 2008 goldman and smith 2011 the leading explanations for the increased gaps in life expectancy involve differential trends in smoking diet and exercise stress chronic disease management and access to health care less well known however is the impact these trends will have on public programs and their progressivity especially social security and medicare to fill this gap this paper uses the future elderly model fem a microsimulation model of health and economic outcomes for older americans to estimate the effects of steeper mortality gradients on the progressivity of social security and medicare benefits

wage declines among older men we examine the evidence on whether real wages decline with age among older men while the general human capital model of wage growth over the life cycle predicts that wages will fall as workers approach the end of their career alternative models of wage growth do not predict these wage declines we find that in longitudinal estimates of age wage profiles wage declines only set in for workers in their 60s furthermore these longitudinal declines are at least partly due to interactions with the social security system the earnings cap or other effects of social security appear to lead some workers to choose jobs and job characteristics associated with lower wages copyright 1996 by mit press

healthy bodies and thick wallets the dual relation between health and economic status there is abundant evidence of a quantitatively large association between many measures of economic status including income and wealth and a variety of health outcomes such as mortality or morbidity however considerable and often heated debate remains especially across disciplines about the direction of causation and about why the association arises although medical scientists are often convinced that the dominant if not exclusive pathway is that variation in socioeconomic status produces health disparities they are increasingly debating among themselves about why low economic status might lead to poor health at least for modern industrial countries 1 the old standby arguments the less well to do have access to less or lower quality medical care or a stronger pattern of deleterious personal behaviors have been rejected as insufficient instead a series of intriguing competing theories have arisen that emphasize long term impacts of early childhood or even inter uterine environmental factors the cumulative effects of prolonged exposures to individual stressful events or reactions to macro societal factors such as rising levels of income inequality a common link is that each theory attempts to document the physiological processes through which low economic status leads to poorer health while these scientific questions are extremely important this research has taken place with little input from economists economists are now making contributions about the alternative pathway the impact poor health may have on economic resources poor health may restrict a family s capacity to earn income or to accumulate assets by limiting work or by raising medical expenses at a minimum this work should provide a caution against exaggerating the magnitude of causation from economic status to health outcomes but the potential contribution runs deeper as people age the evolving variation in individual health outcomes may offer additional statistical information to estimate parameters of household savings and consumption behavior that so far have proven to be somewhat elusive thus incorporating health uncertainty and risk into economic models should eventually enrich our understanding of basic tenets of household behavior the first section of this paper documents the size of the association between health and one prominent economic status measure household wealth section two deals with how health influences economic status by sketching out reasons why health may alter household savings and eventually wealth and then providing estimates of the empirical magnitude of these effects section three shifts attention to the alternative pathway the links between economic status and health and summarizes 2major controversies and evidence surrounding these issues

aging pension reform and capital flows a multi country simulation model we present a quantitative analysis of the effects of population aging and pension reform on international capital markets first demographic change alters the time path of aggregate savings within each country second this process may be amplified when a pension reform shifts old age provision towards more pre funding third while the patterns of population aging are similar in most countries timing and initial conditions differ substantially hence to the extent that capital is internationally mobile population aging will induce capital flows between countries all three effects influence the rate of return to capital and interact with the demand for capital in production and with labor supply in order to quantify these effects we develop a computational general equilibrium model we feed this multi country overlapping generations model with detailed long term demographic projections for seven world regions our simulations indicate that capital flows from fast aging regions to the rest of the world will initially be substantial but that trends are reversed when households decumulate savings we also conclude that closed economy models of pension reform miss quantitatively important effects of international capital mobility this version 25 august 2004

the determinants of the macroeconomic implications of aging abstract the aging of the us population undoubtedly will be associated with macroeconomic changes in particular some combination of lower consumption growth and increased labor input will ultimat

restoring rational choice the challenge of consumer financial regulation abstract this lecture considers the case for consumer financial regulation in an environment where many households lack the knowledge to manage their financial affairs effectively the lecture argu

innovation networking and proximity lessons from small high technology firms in the uk the article explores how the innovative performance of small high tech firms relates to their external networking activities and whether geographical proximity in their network relations matters data from a small sample of electronics firms and software developers in south east england are used to construct indicators of innovativeness which are correlated with variables capturing intensity of external interactions and proximity benefits the regional science base is found to have played a key role in nurturing new high tech ventures but science parks had not contributed to this interaction with parties with complementary capabilities such as suppliers and service providers is also associated with high innovative performance however the findings do not support the current policy fashion of encouraging regional networks revolving around firms in similar business activities and close customer relations

tax uncertainty and retirement savings diversification abstract we investigate the optimal savings decisions for investors with access to pre tax traditional and post tax roth versions of tax advantaged retirement accounts the model features a progressive tax schedule and uncertainty over future tax rates traditional accounts are valuable for hedging retirement account performance and managing current income near tax bracket cutoffs whereas roth accounts allow investors to mitigate uncertainty over future tax schedules the optimal asset location policy for most households involves diversifying between traditional and roth vehicles contrary to conventional advice the substantial economic benefits from roth investments are not limited to investors with low current income

the composition and drawdown of wealth in retirement as the baby boomers approach and enter their retirement years the accumulation phase of their life cycle is nearly over thus the focus of many researchers financial services firms and public policymakers concerned with retirement saving is shifting from the accumulation of resources while working to the drawdown of resources during retirement retired households are dependent on the annuitized income streams that they have built up during their working careers and on the wealth that they have accumulated in other forms the two most common annuitized income streams are social security benefits and the payments from defined benefit pension plans these payout streams provide income for life and thus provide some protection against falling into poverty if one lives an especially long life the three most common sources of accumulated wealth are equity in an owner occupied home financial assets such as bonds and stocks and financial assets held in a personal retirement account such as an individual retirement arrangement or a 401 k plan throughout our analysis we will define retirement age households as those headed by someone between the ages of 65 and 69 in 2008 just over 80 percent of these households had some equity in their home or another property while 52 percent had assets in personal retirement accounts a much higher fraction 87 percent had some financial assets outside their retirement accounts but for many households the amount of such assets was relatively modest only 45 percent had more than 20 000 in non retirement account financial assets the median financial asset holding for this group including holdings in personal retirement accounts is 52 000 in short many households have small enough amounts of accumulated wealth that they will depend heavily on the life contingent payout streams offered by social security and if they have one a defined benefit pension this paper presents evidence on the resources available to households as they enter retirement it draws heavily on data collected by the health and retirement study which we sometimes refer to as the hrs we calculate the potential additional annuity income that households could purchase given their holdings of non annuitized financial assets at the start of retirement even if households used all of their financial assets inside and outside personal retirement accounts to purchase a life annuity only 47 percent of households between the ages of 65 and 69 in 2008 could increase their life contingent income by more than 5 000 per year at the upper end of the wealth distribution however a substantial number of households could make large annuity purchases we also consider the role of housing equity in the portfolios of retirement age households and explore the extent to which households draw down housing equity and financial assets as they age we find that many households appear to treat housing equity and non annuitized financial assets as precautionary savings tending to draw them down only when they experience a shock such as the death of a spouse or a period of substantial medical outlays because home equity is often conserved until very late in life for many households it may provide some insurance against the risk of living longer than expected a brief conclusion summarizes our findings and indicates how they bear on a number of policy issues such as the role for annuity defaults in retirement saving plans

optimal defaults and active decisions defaults often have a large influence on consumer decisions we identify an overlooked but practical alternative to defaults requiring individuals to make an explicit choice for themselves we study such active decisions in the context of 401 k saving we find that compelling new hires to make active decisions about 401 k enrollment raises the initial fraction that enroll by 28 percentage points relative to a standard opt in enrollment procedure producing a savings distribution three months after hire that would take 30 months to achieve under standard enrollment we also present a model of 401 k enrollment and derive conditions under which the optimal enrollment regime is automatic enrollment i e default enrollment standard enrollment i e default non enrollment or active decisions i e no default and compulsory choice active decisions are optimal when consumers have a strong propensity to procrastinate and savings preferences are highly heterogeneous financial illiteracy however favors default enrollment over active decision enrollment

business brokers and borders the structure of west african trade networks abstractthe objective of this paper is to show how a formal approach to networks can make a significant contribution to the study of cross border trade in west africa building on the formal tools and theories developed by social network analysis we examine the network organisation of 136 large traders in two border regions between niger nigeria and benin in a business environment where transaction costs are extremely high we find that decentralised networks are well adapted to the various uncertainties induced by long distance trade we also find that long distance trade relies both on the trust and cooperation shared among local traders and on the distant ties developed with foreign partners from a different origin religion or culture studying the spatial structure of trade networks we find that in those markets where trade is recent and where most of the traders are not native of the region national borders are likely to exert a greater influence than in those regions where trade has pre colon