home production and social security reform this paper incorporates home production into a dynamic general equilibrium model of overlapping generations with endogenous retirement to study social se curity reforms as such the model dierentiates both consumption goods and labor eort according to their respective roles in home production and market activities using a calibrated model we nd that eliminating the current pay as you go social security system has important implications for both labor supply and consumption decisions and that these decisions are in uenced by the presence of a home production technology comparing our benchmark economy to one with dierentiated goods but no home production we nd that eliminating social security bene ts generates larger welfare gains in the presence of home produc tion this result is due to the self insurance aspects generated by the presence of home production comparing our economy to a one good economy without home production we show that the welfare gains of eliminating social security are magni ed even further these policy analyses suggest the importance of mod eling home production and distinguishing between both time use and consumption goods depending on whether they are involved in market or home production

individual risk in an investment based social security system this paper examines the risk aspects of an investment based defined contribution social security plan we focus on the risk after the plan is fully phased in individuals deposit a fraction of wages to a personal retirement account pra invest these funds in a 60 40 equity debt mix and in a similarly invested annuity at age 67 the value of the assets follows a random walk with mean and variance of a 60 40 equity debt portfolio over the period 1946 95 a mean log return of 5 5 percent net of administrative costs of 0 4 percent and a standard deviation of 12 5 percent we study he stochastic distributions of this process by doing 10 000 simulations of the 80 year experience of the cohort that reached age 21 in 1998 the resulting annuities are compared to the future defined benefits specified in current law the benchmark benefits with no uncertainty a 5 5 percent log return would permit the benchmark benefits to be purchased with pra deposits of 3 1 percent of payroll only one sixth of the pay as you go tax needed for the benchmark benefits saving a higher share of wages provides a cushion that protects the individual from the risk of an unacceptably low level of benefits for example pra deposits of 6 percent of wages reduces the probability that the benefits are less than the benchmark to 0 17 and the probability that they are less than 61 percent of the benchmark to 0 05 pra deposits of 9 percent of wages half of the tax rate required in a pay as you go system would substantially reduce these risks this pure investment based plan is an extreme case the investment risk can be reduced further by using a mixed system that combines pay as you go and investment based components or that makes intergenerational transfers conditional on the performance of stock and bond prices this abstract was borrowed from another version of this item

economic and policy analysis for solar pv systems in indiana in recent years the energy market in the us and globally is expanding the production of renewable energy solar energy for electricity is also expanding in the us indiana is one of the states expanding solar energy with solar photovoltaic pv systems therefore we conduct benefit cost analysis with several uncertain input variables to determine the economics of adopting solar pv systems in indiana based on policy instruments that could increase adoption of solar pv systems the specific objectives are analyses of the cost distribution of solar pv systems compared with grid electricity in homes and estimating the probability that solar can be cheaper than electricity from grids under different policy combinations we first do the analysis under current policy and then the analysis under potential policy options for a variety of scenarios also the results inform government policy makers on how effective the alternative policies for encouraging solar pv systems are the results show that current policies are important in reducing the cost of solar pv systems however with current policies there is only 50 50 chance of solar being cheaper than electricity from grids if potential policies are implemented solar pv systems can be more economical than grid electricity

time inconsistent preferences and social security in this paper we examine the role of social security in an economy populated by overlapping generations of individuals with time inconsistent preferences who face mortality risk individual income risk and borrowing constraints we find that unfunded social security lowers the capital stock output and consumption for consumers with time consistent or time inconsistent preferences however it may raise or lower welfare depending on the strength of time inconsistency

demand pull technology push and government led incentives for non incremental technical change abstract rising expectations about future demand for new technologies increase the incentives for investments in innovation by enlarging payoffs to successful innovations how well does this notion of demand pull apply to non incremental technological change when demand is largely attributable to actions by governments in this case inventors of the most important inventions did not respond positively to strong demand pull policies filing of highly cited patents declined precipitously just as demand for wind power created a multi billion dollar market three explanations for this apparent inconsistency with the demand pull hypothesis played a role 1 the rapid convergence on a single dominant design limited the market opportunity for non incremental technical improvements 2 even though the policies implemented were stringent enough to stimulate demand uncertainty in their longevity dampened the incentives for inventions that were likely to take several years to pay off and 3 alternative explanations such as declining r d funding and weakening presidential engagement on energy appear to have been important

sophisticated entry in a model of spatial competition we analyze free entry equilibrium in a model of spatial competition in which locations of established firms are fixed and entrants profit expectations are rational our most interesting results concern large economies economies in which the number of firms is arbitrarily large when the average cost function is u shaped free entry equilibrium is unique socially optimal and characterized by zero profit in contract when there are no diseconomies of scale even large economies are stubbornly imperfect firms can earn substantial pure profit and free entry equilibrium is neither unique nor socially optimal

default and punishment in general equilibrium we extend the standard model of general equilibrium with incomplete markets to allow for default and punishment by thinking of assets as pools the equilibrating variables include expected delivery rates along with the usual prices of assets and commodities by reinterpreting the variables our model encompasses a broad range of adverse selection and signalling phenomena in a perfectly competitive general equilibrium framework perfect competition eliminates the need for lenders to compute how the size of their loan or the price they quote might affect default rates it also makes for a simple equilibrium refinement which we propose in order to rule out irrational pessimism about deliveries of untraded assets we show that refined equilibrium always exists in our model and that default in conjunction with refinement opens the door to a theory of endogenous assets the market chooses the promises default penalties and quantity constraints of actively traded assets

a simulation based approach to price optimisation of the mixed bundling problem with capacity constraints abstract in this paper we analyse a service provider s mixed bundling problem for services such as sporting events or holiday packages pursuing the objective of maximising total revenue the service provider has to determine static prices for each single product at the beginning of the selling period additionally an optimal package price has to be chosen for the bundle that comprises one unit of each single product because of capacity constraints the availability of products can change over time such that consumers are forced to switch from their preferred subset of products to an alternative following dynamic substitution we propose two mixed integer linear programmes based on reservation prices that appropriately model the consumer choice process to address the bundling problem it becomes evident that the determination of the optimal prices is computationally expensive even for small problem classes therefore we develop metaheuristics using variable neighbourhoods to evaluate their performance we propose the following new approach our extensive computational study is performed using especially generated scenarios for which the optimal product prices are known for this purpose we present a set of conditions for the generation of reservation prices that guarantee the optimality of the predefined prices based on our computational results managerial insights are derived

bundling as an entry barrier in this paper we look at the case for bundling in an oligopolistic environment we show that bundling is a particularly effective entry deterrent strategy a company that has market power in two goods a and b can by bundling them together make it harder for a rival with only one of these goods to enter the market bundling allows an incumbent to credibly defend both products without having to price low in each the traditional explanation for bundling that economists have given is that it serves as an effective tool of price discrimination by a monopolist although price discrimination provides a reason to bundle the gains are small compared with the gains from the entry deterrent effect i introduction in this paper we look at the case for bundling in an oligopolistic environment we show that bundling is a particularly effective entry deterrent strategy a company that has market power in two goods a and b can by bundling them together make it harder for a rival with only one of these goods to enter the market bundling allows an incumbent to defend both products without having to price low in each while it is still possible to compete by offering a rival bundle a monopolist can significantly lower the potential profits of a one product entrant without having to engage in limit pricing prior to entry we also show that bundling continues to be an effective pricing tool even if entry deterrence fails or if there is already an existing one product rival a company with a monopoly in product a and a duopoly in product b makes higher profits by selling an a b bundle than by selling a and b independently leveraging market power from a into b and accepting some one product competition against the bundle is better than using the monopoly power in good a all by itself since bundling mitigates the impact of competition on the incumbent an entrant can expect the bundling strategy to persist even without any commitment the traditional explanation for bundling that economists have given is that it serves as an effective tool of price discrimination by a monopolist see stigler 1968 adams and yellen

optimal taxation in life cycle economies abstract we use a very standard life cycle growth model in which individuals have a labor leisure choice in each period of their lives to prove that an optimizing government will almost always find it optimal to tax or subsidize interest income the intuition for our result is straightforward in a life cycle model the individual s optimal consumption work plan is almost never constant and an optimizing government almost always taxes consumption goods and labor earnings at different rates over an individual s lifetime one way to achieve this goal is to use capital and labor income taxes that vary with age if tax rates cannot be conditioned on age a nonzero tax on capital income is also optimal as it can imperfectly mimic age conditioned consumption and labor income tax rates journal of economic literature classification numbers e62 h21

endogenous life cycle housing investment and portfolio allocation this paper develops a life cycle portfolio allocation model to address the effects of housing investment on the portfolio allocation of households the model employs a comprehensive housing investment structure epstein zin recursive preferences and a stock market entry cost furthermore rather than resorting to calibration we estimate the value of the relative risk aversion and elasticity of intertemporal substitution the model shows that housing investment has a strong crowding out effect on investment in risky assets throughout the life cycle we further find that the effect of the presence of housing investment on households portfolio allocation is larger than the effect of having ez recursive preferences jel classification g0 g11 g12 d10

energy based economic development abstract the fields of economic development and energy policy and planning have converged in recent years to form an emerging discipline which we term energy based economic development ebed despite the significant amount of stimulus funds as well as state and local funding that are being allocated to ebed initiatives in the united states the emerging discipline has received scant attention in the energy policy and development literature the link between energy and economic development in the literature is still theoretical mostly focused on the need for and the potential benefits of ebed and rarely applied furthermore funding for ebed has outpaced understanding of the discipline development of rigorous technical approaches and meaningful ways to measure impact such information would not only help practitioners and policymakers more thoroughly understand the confines of the discipline and shape goals and approaches accordingly but also help researchers identify track and evaluate a variety of activities in the field with national and international attention focused on the convergence of these fields researchers and practitioners have a rare opportunity to develop and implement the tools necessary to evaluate and communicate the potentially broader impacts that ebed may hold for society if ways to leverage and sustain the injection of funds in this discipline are not identified the opportunity may end before we can achieve either energy policy or economic development goals in an attempt to respond to this need this analysis explores the connection between energy and economic development beginning with a review of the trends in each field and the goals that each seeks to achieve on the basis of this information we define the discipline of ebed review the existing literature on it and offer insights and perspectives on its emergence

the principle of minimum differentiation revisited abstract hotelling s model of differentiated products is examined and modified so that consumers have relatively low reservation prices for the differentiated products the problem of existence of a nash equilibrium in prices in a duopoly with given products is analysed when the reservation price is relatively low a nash equilibrium in prices exists for a larger range of products than when the reservation price is infinite next i examine product competition with instantaneous adjustment to the nash equilibrium prices of the previous game firms competing in a nash fashion have tendencies to move away from each other and try to achieve local monopolistic positions this is in sharp contrast with the acclaimed principle of minimum differentiation of the original model of hotelling of high reservation price where firms clustered in the product space

social security and unsecured debt abstract in this paper we use a calibrated life cycle model to explore quantitatively ways of reducing the burden of social security in a world populated by both optimizing and rule of thumb consumers social security contributions force young households with upward sloping income profiles to save a sizeable portion of their income for retirement when their optimal consumption plan would likely have them either saving little or borrowing we first use household data to document that young households have accumulated social security contributions that are large relative to debt holdings then using a calibrated life cycle model we show that both allowing households to use social security wealth to pay off their debt and exempting young households from social security contributions but in both cases requiring higher contributions later mitigate many of the inefficiencies of social security from the perspective of life cycle financial planning specifically in our preferred experiment which exempts households whose heads are under 30 from making social security contributions we find that certainty equivalent consumption increases by 3 4 for optimizing households and by 3 3 for rule of thumb households

social security and individual welfare precautionary saving borrowing constraints and the payroll tax this paper examines the impact of social security on national saving and individual welfare in the presence of realistic capital market imperfections market failure in the private provision of annuities and restrictions on borrowing against anticipated future wages the introduction of social security increases lifetime welfare and reduces national saving if borrowing restrictions are absent however the increase in individual welfare is reduced and in some cases eliminated when borrowing constraints are taken into consideration the substantial difference suggests the importance of reexamining the proportional payroll tax finance of social security copyright 1987 by american economic association

symmetric equilibrium existence and optimality in differentiated product markets abstract equilibrium existence and optimality are analysed in a market for products differentiated by their variety a game of three stages is analysed firms enter in the first stage choose varieties in the second stage and choose prices in the third stage the existence of subgame perfect equilibria is established at equilibrium products are symmetrically located in the space of characteristics and are offered at equal prices the surplus maximizing solution is characterized and it is shown that surplus maximizing product diversity is lower than the equilibrium one

bundling information goods of decreasing value consumers average value for information goods websites weather forecasts music and news declines with the number consumed this paper provides simple guidelines to optimal bundling marketing strategies in this case if consumers values do not decrease too quickly we show that bundling is approximately optimal if consumers values to subsequent goods decrease quickly we show by example that one should expect bundling to be suboptimal

borrowing costs and the demand for equity over the life cycle abstract we construct a life cycle model that delivers realistic behavior for both equity holdings and borrowing the key model ingredient is a wedge between the cost of borrowing and the risk free investment return borrowing can either raise or lower equity demand depending on the cost of borrowing a borrowing rate equal to the expected return on equity which we show roughly matches the data minimizes the demand for equity alternative models with no borrowing or limited borrowing at the risk free rate cannot simultaneously fit empirical evidence on borrowing and equity holdings

tying foreclosure and exclusion in recent years the leverage theory of tied good sales has faced heavy and influential criticism in an important sense though the models used by its critics are actually incapable of addressing the leverage theory s central concerns here the author reconsiders the leverage hypothesis and argues that tying can indeed serve as a mechanism for leveraging market power the mechanism through which this leverage occurs its profitability and its welfare implications are discussed in detail copyright 1990 by american economic association

gaussian demand and commodity bundling in an important and widely cited essay adams and yellen 1976 examine the use of package selling as a price discrimination device they consider a monopolist producing two goods with constant unit costs and facing buyers with diverse tastes the marginal utility of a second unit of either good is assumed to be zero for all buyers the two goods are independent in demand for all buyers so that any buyer s reservation price for the first unit of either good is independent of the market price of the other thus the maximum amount any buyer would pay for a bundle consisting of one unit of each good is the sum of the two reservation prices and buyers are completely described by the values of those two prices 2 resale markets are assumed away in order to obtain comparative results for alternative pricing strategies the distribution of reservation prices in the adams yellen framework is assumed to be bivariate normal implications of gaussian demand are explored pure bundling is shown to operate by reducing buyer diversity thus facilitating the capture of consumers surplus it generally makes buyers worse off than unbundled sales it is more profitable if average reservation prices are high enough mixed bundling combines advantages of both pure bundling and unbundled sales and it is generally strictly more profitable than either bundling which treats goods symmetrically seems most attractive under symmetric reservation price distributions i am indebted to severin borenstein for superb research assistance to the ford motor company for research support through a grant to m i t and to the harvard economics department for housing me as a visiting scholar while most of this research was performed of course only i can be held responsible for this essay s shortcomings 1 the first clear recognition of this possibility seems to have been by stigler 1968 but also see burstein 1960 2 paroush and peles 1981 relax the assumption that consumers purchase at most one unit of each good but they consider only two types of buyers both with linear demand functions they retain the assumption that demands are independent for all buyers telser 1979 and phillips 1981 use different frameworks to analyze bundling policies spence 1980 explores the relation between bundling across commodities as here and bundling multiple units of the same

targeted advertising the role of subscriber characteristics in media markets this paper seeks to establish the importance of targeted advertising in media markets using zip code level circulation for us daily newspapers i show that newspapers facing more competition have lower circulation prices but higher advertising prices than similar newspapers facing little or no competition i explain this by showing that newspapers in more competitive markets are better able to segment readers according to their location and demographics this leads to greater homogeneity in the characteristics of subscribers and raises advertisers willingness to pay for such readers the results imply a substantial benefit to advertisers and media firms from targeted advertising

a social capital paradox entrepreneurial dynamism in a small world clean technology cluster abstract clean tech entrepreneurs have struggled to gain investor confidence because of some particular characteristics and circumstances of the industry this research combines network and sustainable development literature in the clean tech context to support the logic of a new investment approach that may stimulate sustainable investing in clean tech theory is proposed to suggest that there may be an advantageous social capital paradox where strong ties in a cluster lead to dynamism rather than decay the clean tech industry provides a context where strong ties offer network stability in a small world cluster such that it is a value creating organizational form offering greater dynamism two related propositions are developed to support the social capital paradox they lead to a theoretical conclusion that long term integrated partner solutions where partners are also resource constrained lead to successful alliances supporting a dynamic cluster that will grow over time a practical conclusion is that investing in a connected cluster of firms might be less risky compared to investing in a new firm or even a portfolio of well diversified assets de risking clean production investments may be achievable through a small world network cluster backed security

which renewable energy policy is a venture capitalist s best friend empirical evidence from a survey of international cleantech investors governments around the world have adopted ambitious targets to increase the share of renewable energy and reduce greenhouse gas emissions they pursue a variety of policy approaches to achieve these targets it has been a popular theme for contributions in energy policy to investigate the effectiveness of such policies this article adds a new perspective to the debate namely looking at the policy preferences of private investors in innovative clean energy technology firms we surveyed 60 investment professionals from european and north american venture capital and private equity funds and asked them to assess the effectiveness of various policies in terms of stimulating their interest to invest in innovative clean energy technologies in addition to quantitative rankings we use qualitative interview data to capture additional information on why investors prefer some policies over others the combined analysis compensates for the inherent limitations of a quantitative ranking using generic policy types the results of this exploratory analysis demonstrate that all other things being equal investors in our sample perceived feed in tariffs to be the most effective renewable energy policy the overall preference for feed in tariffs is even more pronounced among investors based in europe and with higher exposure to clean energy

capital accumulation and uncertain lifetimes with adverse selection this paper examines the implications of adverse selection in the private annuity market for the pricing of private annuities and the consequent effects on constrption and bequest behavior with privately known heterogeneous mortality probabilities adverse selection causes the rate of return on private annuities to be less than the actuarially fair rate based on population average mortality however a fully funded social security system with compulsory participation can offer an implied rate of return equal to the actuarially fair rate based on population average mortality thus since social security offers a higher rate of return than private annuities consumers cannot completely offset the effects of social security by transacting in the private annuity market using an overlapping generations model with uncertain lifetimes we demonstrate that the introduction of actuarially fair social security reduces the steady state rate of return on annuities and raises the steady state levels of average bequests and average consumption of the young the steady state national capital stock rises or falls according to the strength of the bequest motive this abstract was borrowed from another version of this item

do liquidity constraints and interest rates matter for consumer behavior evidence from credit card data this paper utilizes a unique new dataset of credit card accounts to analyze how people respond to changes in credit supply the data consist of a panel of thousands of individual credit card accounts from several different card issuers with associated credit bureau data we estimate both marginal propensities to consume mpcs out of liquidity and interest rate elasticities we also evaluate the ability of different models of consumption to rationalize our results distinguishing the permanent income hypothesis pih liquidity constraints precautionary saving and behavioral models we find that increases in credit limits generate an immediate and significant rise in debt counter to the pih the average mpc out of liquidity ddebt dlimit ranges between 10 14 the mpc is much larger for people starting near their limits consistent with binding liquidity constraints however the mpc is significant even for people starting well below their limit we show this response is consistent with buffer stock models of precautionary saving nonetheless there are other results that conventional models cannot easily explain e g why so many people are borrowing on their credit cards and simultaneously holding low yielding assets unlike most other studies we also find strong effects from changes in account specific interest rates the long run elasticity of debt to the interest rate is approximately 1 3 less than half of this elasticity represents balance shifting across cards with most reflecting net changes in total borrowing the elasticity is larger for decreases in interest rates than for increases which can explain the widespread use of temporary promotional rates the elasticity is smaller for people starting near their credit limits again consistent with liquidity constraints

uncertain lifetimes and the welfare enhancing properties of annuity markets and social security this paper explores the implications of social security programs and annuity markets through which agents who are characterized by different distributions of length of lifetime share deathrelated risks when annuity markets operate a non discriminatory social security program affects only the intragenerational allocation of resources in the absence of private information regarding individual survival probabilities such a program will lead to a non optimal intragenerational allocation of resources however the presence of adverse selection considerations gives rise to a pareto improving role for a mandatory non discriminatory social security program

consumption savings decisions with quasi geometric discounting we study the consumption savings problem of an infinitely lived rational consumer who has time inconsistent preferences in the form of quasi geometric discounting the consumer operates a weakly concave production function and must simply divide current resources into current consumption and savings there is no uncertainty a solution to the consumer s problem is a subgame perfect equilibrium of a dynamic game between the consumer s successive selves we show that this game has a continuum of equilibria in stationary markov strategies not only is the stationary point of the consumer s asset holdings indeterminate but each stationary point has a continuum of dynamic paths converging to it the savings policy rules underlying these dynamic paths are step functions

a strategic motivation for commodity bundling the analytical literature on commodity bundling explains the practice of selling two or more differentiated products in a single package as a surrogate for direct price discrimination in contrast this paper shows that imperfect competition creates a strategic incentive to bundle the profitability of bundling whether it adversely affects rival producers and whether it yields an overall efficiency gain depends inter alia on the nature of product market competition the role of complementarity in explaining why firms bundle is also explored copyright 1990 by blackwell publishing ltd

optimal bundling under imperfect competition abstract this paper examines the profitability of bundling for a two product seller of differentiated products facing competition from a one product rival in the presence of imperfect competition pure bundling emerges as the optimal pricing strategy other than ensuring the monopoly product can only be purchased in a bundle pure bundling s additional advantages stand in its ability to i prevent consumers from forming their own bundle using the single product seller s product ii reduce aggressiveness in pricing and iii smooth over the variation in valuations consumers have for the two types of products however the profit maximizing strategy is not welfare maximizing consumers are best off when all products are available a la carte only the competitor maximizes profits under mixed bundling and total welfare would be highest if the two product supplier were to offer only the monopoly product a la carte

product bundling impacts of product heterogeneity and risk considerations abstract bundling has been extensively studied in the literature and its benefits have been manifested through three perspectives of achieving better price discrimination helping to save costs and preserving the power for deterring a potential entrant in this study we examine two aspects of bundling which have not been studied before we examine the impact of product heterogeneity on bundling decisions we also address risk considerations in a bundling problem specifically we consider a retailer who has the option of selling a bundle of two products pure bundling policy or selling the products separately no bundling policy the retailer could also face a product selection problem for which we consider three scenarios of choosing two products with perfectly positively correlated perfectly negatively correlated or independent reservation prices we use a mean variance approach to include retailer s risk through her profit variability when maximizing the expected value of profit we characterize the conditions under which a policy or scenario performs better than the others under the influence of product heterogeneity and or retailer s risk aversion among other findings we show that optimal bundling price chosen by a risk averse decision maker cannot be larger than the one chosen by a risk neutral decision maker

opting out of social security abstract the liability facing a pay as you go social security system can be calculated in several ways many conversions including that which took place in chile and in many plans to convert the u s system assume the largest measure known as the shutdown liability this measure pays many workers who have contributed to the public system more money than the public system is actually worth to them thereby placing a larger burden on future generations but other liability measures are hard to implement due to an information asymmetry between the government and individuals about an individual s skill level this paper demonstrates that a very simple reform plan simply letting people opt out of social security generates a truthful revelation equilibrium in which agents reveal private information about their skill levels the new assumed liability measure is much smaller since it more accurately assigns a liability to each individual a smaller liability therefore is passed onto future generations which also generates quicker transition paths it also does a better job protecting the welfare of the initial elderly when general revenue is used to pay for the transition simulation evidence is provided using a large scale lifecycle model with heterogeneous skill levels

what accounts for the variation in retirement wealth among u s households even among households with similar socioeconomic characteristics saving and wealth vary considerably life cycle models attribute this variation to differences in time preference rates risk tolerance exposure to uncertainty relative tastes for work and leisure at advanced ages and income replacement rates these factors have testable implications concerning the relation between accumulated wealth and the shape of the consumption profile using the panel study of income dynamics and the consumer expenditure survey we find little support for these implications the data are instead consistent with rule of thumb mental accounting or hyperbolic discounting theories of wealth accumulation jel di d91 e21

consumption retirement and social security evaluating the efficiency of reform that encourages longer careers abstract this paper proposes and analyzes a social security reform in which individuals no longer face the oasi payroll tax after say age 54 or a career of 34 years and their subsequent earnings have no bearing on their benefits we first estimate parameters of a life cycle model our specification includes non separable preferences and possible disability it predicts a consumption expenditure change at retirement we use the magnitude of the expenditure change together with households retirement age decisions to identify key structural parameters the estimated magnitude of the change in consumption expenditure depends importantly on the treatment of consumption by adult children of the household simulations indicate that the reform could increase retirement ages one year or more equivalent variations could average more than 4000 per household and income tax revenues per household could increase by more than 14 000

why firms may prefer not to price discriminate via mixed bundling abstract we analyze a simple model of joint purchase discounts using a discrete choice framework to characterize consumer choices the model suggests that mixed bundling is more likely to be associated with monopoly this is due to the benefits reaped via price discrimination in a duopoly environment however only pure components pricing may be offered in equilibrium since firms fear the extra degree of competition inherent in mixed bundling

equilibrium product bundling this article offers an equilibrium theory of product bundling by rival firms in several models where a primary good is produced in a duopoly market and one or more other goods is produced under perfectly competitive conditions bundling is shown to emerge as an equilibrium strategy of one or both of the duopolists for its role as a product differentiation device when the rival firms can commit to bundling sales their profits are higher but social welfare is reduced copyright 1997 by university of chicago press

social security investment in equities this paper explores the general equilibrium impact of social security portfolio diversification into private securities either through the trust fund or private accounts the analysis depends critically on heterogeneities in saving production assets and taxes limited diversification weakly increases interest rates reduces the expected return on short term investment and the equity premium decreases safe investment increases risky investment and increases a suitably weighted social welfare function however the effects on aggregate investment long term capital values and the utility of young savers hinges on assumptions about technology aggregate investment and long term asset values can move in opposite directions jel h55

a graphical analysis of bundling by comparing the demand for a bundle and the vertical sum of the demands for its components this article analyzes the profitability and welfare consequences of bundling if it does not lower costs bundling tends to be profitable when reservation values are negatively correlated and high relative to costs if bundling lowers costs and costs are high relative to average reservation values positively correlated reservation values increase the incentive to bundle bundling and charging a price equal to the sum of the components prices lowers consumer surplus bundling can however increase consumer surplus when it results in lower prices copyright 1995 by university of chicago press

start up sustainability an insurmountable cost or a life giving investment abstract an outstanding question in the entrepreneurship literature reigns given recent emphases on sustainable business practices and corporate social responsibility if small start ups are generally stretched for time and resources does it enhance their chances for survival and success to be sustainable and socially responsible new firms can aid in rectifying pressing environmental and social issues by being more sustainable while many entrepreneurs like a sustainable business model and or mission investment may not follow so willingly this paper examines a sample of 300 start ups across thirty cities around the world to consider whether sustainability is rewarded by investors investors signal confidence in start ups when they infuse life extending investments into them this analysis also considers whether a more sustainable national context affects investor confidence and whether a sustainable firm within a sustainable national context gains more investor attention and investment results show that investors avoid sustainable firms particularly those that are environmentally sustainable moreover investors enjoy national contexts that are socially responsible but pay no attention to those that are environmentally conscious in addition firms that are sustainable in a sustainable national context are not better off for attracting investment insights for policy are that mainstream investors are attracted by national social policies but these investors are unlikely to be the main force behind sustainable venture growth under today s conditions

multiproduct monopoly commodity bundling and correlation of values through what selling strategy can a multiproduct monopolist maximize his profits when his knowledge about individual consumers preferences is limited one possibility extensively studied in the context of a single good monopoly is to use quantity dependent pricing as a means of discriminating among customers with differing tastes see for example oi 1971 and maskin and riley 1984 an alternative technique for price discrimination first suggested by stigler 1968 and analyzed further by adams and yellen 1976 is for the monopolist to package two or more products in bundles rather than selling them separately through a series of examples adams and yellen illustrate that bundling can serve as a useful price discrimination device even when all consumers willingnesses to pay for each of the goods individually are unaffected by whether they are also consuming the other product a typical example is illustrated in figure i adapted from figure iv in adams and yellen where there are two goods three consumers ab c who consume at most one unit of each good with reservation values for each good that are independent of whether the other good is consumed and zero costs of production there a bundle offered at a price of 100 fully extracts all potential surplus which would be impossible pricing the goods independently unfortunately though these authors do not provide any general characterization of the circumstances in which bundling is actually a multiproduct monopolist s optimal strategy their examples however such as figure i create the impression that the profitable use of bundling

the two faces of market support how deployment policies affect technological exploration and exploitation in the solar photovoltaic industry the recent years have seen a strong rise in policies aiming to increase the diffusion of clean energy technologies while there is general agreement that such deployment policies have been very effective in bringing technologies to the market it is less understood how these policies affect technological innovation to shed more light on this important question we conducted comparative case studies with a global sample of 9 firms producing solar photovoltaic pv modules complemented by in depth interviews with 16 leading pv industry experts we propose that on the one hand policy induced market growth serves as an important catalyst for innovative activity as it raises the absolute level of firm investments in technological exploration on the other hand however deployment policies create an incentive for firms pursuing more mature technologies to shift their balance between exploitation and exploration toward exploitation firms focusing on less mature technologies cannot tap the potentials of exploitative learning to the same extent as those with more mature technologies therefore stimulating strong market growth may raise the barrier to market entry for less mature technologies we conclude that when designing deployment policies great care should be taken to avoid adverse effects on technological diversity and a premature lock in into more established technologies

default insurance and debt over the life cycle abstract the widespread use of debt and default suggests that unsecured credit markets play an important role in consumption smoothing in this paper i address two previously unanswered questions first how does policy towards debt default affect the evolution of consumption and net worth over the life cycle second how does debt default policy interact with social insurance over the life cycle the findings are as follows first us default policy appears lax in the sense that it creates severe credit constraints especially for the young second eliminating default will lower consumption inequality among the young but will increase it among the old third social insurance alters default risk and in turn loan pricing and therefore matters for purely intertemporal smoothing

green investment trends and determinants abstract this paper fills a gap in the macroeconomic literature on renewable sources of energy it offers a definition of green investment and analyzes the trends and determinants of this investment over the last decade for 35 advanced and emerging countries we use a new multi country historical dataset and find that green investment has become a key driver of the energy sector and that its rapid growth is now mostly driven by china our econometric results suggest that green investment is boosted by economic growth a sound financial system conducive to low interest rates and high fuel prices we also find that some policy interventions such as the introduction of carbon pricing schemes or feed in tariffs which require use of green energy have a positive and significant impact on green investment other interventions such as biofuel support do not appear to be associated with higher green investment

commodity bundling by single product monopolies consider two products that have independent demands in the sense that all individual buyers consider them neither substitutes nor complements then if the two products are priced separately the demand for either is independent of the price of the other in his classic analysis of block booking of feature films george stigler shows that it may be profitable for a monopoly seller of two such products to bundle them by requiring a buyer to take both in order to get either his work provides a rationale for tying arrangements that does not depend on technological or other dependencies among the products involved 2 adams and yellen extend the analysis of multiproduct monopoly with independent demands 3 they discuss two different bundling strategies pure bundling in which the seller only offers the products in fixed proportions and mixed bundling in which buyers may either buy the products separately or purchase a bundle with fixed proportions of each in this note i consider a single product monopoly and investigate the profit and welfare implications of bundling its product for some other

clean energy policies and green jobs an evaluation of green jobs in u s metropolitan areas state and local governments in the u s are actively promoting renewable energy and energy efficiency to seek economic development opportunities and create green jobs this study evaluates the employment effects of state and local clean energy and climate policies in u s metropolitan areas msas in 2006 the regression analysis shows that both state and local clean energy policies have positive and statistically significant impacts on green jobs at the metropolitan level the results from two stage probit least squares 2spls indicate that every additional state clean energy policy tool adopted is associated with 1 more green jobs in the msa on average msas with iclei membership maintain 9 3 more green jobs than msas without iclei membership ceteris paribus

a network analysis using metadata to investigate innovation in clean tech implications for energy policy abstract clean technology clean tech is a large and increasing sector research and development r d is the lifeline of the industry and innovation is fostered by a plethora of high tech start ups and small and medium sized enterprises smes any empirical based attempt to detect the pattern of technological innovation in the industry is challenging this paper proposes an investigation of innovation in clean tech using metadata provided by crunchbase metadata reveal information on markets products services and technologies driving innovation in the clean tech industry worldwide and for san francisco the leader in clean tech innovation with more than two hundred specialised companies a network analysis using metadata is the employed methodology and the main metrics of the resulting networks are discussed from an economic point of view the purpose of the paper is to understand specifically specializations and technological complementarities underlying innovative companies detect emerging industrial clusters at the global and local metropolitan level and finally suggest a way to realize whether observed start ups smes and clusters follow a technological path of complementary innovation and market opportunity or instead present a risk of lock in the discussion of the results of the network analysis shows interesting implications for energy policy particularly useful from an operational point of view