input promotion within a complex subsector fertilizer in nigeria despite growing evidence that fertilizers can substantially increase yields and slow down environmental degradation in sub saharan africa ssa the region still lags far behind other developing areas in fertilizer use low use rates persist despite numerous efforts to ease farmers access to quality and affordable fertilizer this article reviews the effects of nigeria s fertilizer policies including fertilizer subsidies on fertilizer use we also compare the old government led fertilizer subsidy scheme with the more recent voucher based programs and their potential effects on private fertilizer sector development based on our analysis of nigeria s experience with fertilizer subsidies we identify the potential major challenges to be faced by the new fertilizer subsidy scheme currently being implemented nationwide

quality based competition profitability and variable costs we consider the impact of variable production costs on competitive behavior in a duopoly where manufacturers compete on quality and price in a two stage game in the pricing stage we make no assumptions regarding these costs other than that they are positive and increasing in quality and no assumptions about whether or not the market is covered in the quality stage we investigate a broad family of variable cost functions and show how the shape of these functions impacts equilibrium product positions profits and market coverage we find that seemingly slight changes to the cost function s curvature can produce dramatically different equilibrium outcomes including the degree of quality differentiation which competitor is more profitable the one offering higher or lower quality and the nature of the market itself covered or uncovered our model helps to predict and explain the diversity of outcomes we see in practice something the previous literature has been unable to do

the food retail revolution in poor countries is it coming or is it over abstract global retail chains are becoming increasingly dominant in the global food trade and their rise leads to dramatic impacts on agricultural supply chains and on small producers however the prospects and impacts of a food retail revolution in poor countries are not yet well understood here i examine this question in madagascar a poor but stable country in which global retailers have been present for over a decade the survey and analysis find that while global retail chains sell better quality food their prices are 40 90 higher ceteris paribus than those seen in traditional retail markets in poor settings characterized by high food price elasticities a lack of willingness to pay for quality and small retail margins supermarkets appear to set prices with an eye toward maximizing profits on the basis of price inelastic demands for quality products from a small middle class interested in one stop shopping it seems unlikely that global retail chains will further increase their food reta

one market one number a composite indicator assessment of eu internal market dynamics we consider the lack of consensus about an appropriate theoretical framework linking sub indicators as a defining characteristic of composite indicators this intrinsic feature implies uncertainties about the appropriate normalization and aggregation of the raw data the two are related index theory offers some valuable guidelines about their connection yet these do not fully solve the basic problem of expert disagreement we embed such residual disagreement in the aggregation method itself specifically we apply an impartial benefit of the doubt weighting procedure where weight restrictions incorporate the available information on experts opinions we apply this procedure to the dynamic performance assessment of eu internal market effects thereby highlighting its capacity to disaggregate member states observed performance shifts into changes relative to benchmarks and performance changes of the benchmarks i e catching up versus genuine progress our results indicate that the latter factor is more important in explaining the observed progress

progress along the path evolving issues in the measurement of genuine saving more than 10 years since a practical linkage between sustainable development and a measure of national wealth expanded to include natural and environmental resources was first posited the empirical estimation of adjusted net savings dubbed genuine saving has evolved considerably in this paper we take stock of both progress achieved and the challenges that remain we begin by recalling the key points made in pearce and atkinson 1993 ecol econ 8 103 which presented the first cross country estimates of savings rates adjusted to reflect depletion and degradation of the environment we then briefly summarise the evolution of the theoretical argument linking savings and sustainability however the main focus of this paper is an aspect that concerned david pearce greatly namely the evolution of the measurement of genuine savings we identify and consider the empirical evidence with regard to two particular measurement issues the valuation of exhaustible resources and environmental degradation common to the both issues are concerns about measuring changes in national wealth in real world economies

how does income inequality affect market outcomes in vertically differentiated markets the distribution of consumer incomes is a key factor in determining the structure of a vertically differentiated industry when consumer s willingness to pay depends on his income this paper computes the shaked and sutton 1982 model for a general specification of consumers income distribution to investigate the effect of inequality on firms entry product quality and pricing decisions the main findings are that greater inequality in consumer incomes leads to the entry of more firms and results in more intense quality competition among the entrants this is due to the elasticity of consumer demand for quality being higher in more inegalitarian economies more intense quality competition among firms causes them to locate their products in higher ranges of the quality spectrum closer to each other decreasing the degree of product differentiation competition between more similar products tends to reduce their prices however when income inequality is very high the top quality producer chooses to serve only the rich segment of the market and the low price elasticity of demand of these consumers allows him to charge a higher price the conclusion is that income inequality has important implications for the degree of product differentiation price level industry concentration and consumer welfare

asymmetric international minimum quality standards and vertical differentiation this paper develops a two country model of a vertically differentiated duopoly that spans two countries which are not integrated without additional costs equilibrium qualities prices profits and consumer s surplus are compared when 1 minimum quality standards are identical and 2 standards differ across countries both markets turn out to be connected by the quality choices of the two firms both firms prices in the two countries and their profits are lower whereas consumer s surplus and the two offered qualities are higher in both countries if no firm is forced out of the country s market with the more demanding minimum quality standard copyright 1995 by blackwell publishing ltd

environmental quality competition and eco labeling abstract a three stage game of investment environmental quality provision and price competition is developed to study the impact of green technology investment eco labeling in a duopoly model of vertical product differentiation the firms incentives to invest in green technologies depend on their relative cost structure when firms are identical with respect to fixed costs both firms will always invest but if one firm is more efficient in investing then the other firm may or may not invest depending on the level of unit cost of investment quality competition will be tighter when the low quality firm is more efficient and looser when the high quality firm is more efficient in investing socially optimal investment for both firms is always positive but lower than in the duopoly solution in the absence of environmental externalities the quality dispersion chosen by profit maximizing firms may be too high or too low while environmental externalities increase the possibility low quality dispersion that is too low within the market solution finally and importantly ecolabeling can be used as a means of reducing excessive investment and increasing environmental quality that is too low

who is vouching for the input voucher decentralized targeting and elite capture in tanzania input subsidy programs carry support as instruments to increase agricultural productivity provided they are market smart this requires especially proper targeting to contain the fiscal pressure with decentralized targeting of input vouchers currently the instrument of choice nonetheless despite clear advantages in administrative costs the fear of elite capture persists these fears are borne out in the experience from the 2008 input voucher pilot program in kilimanjaro tanzania examined here elected village officials received about 60 percent of the distributed vouchers a factor that significantly reduced the targeting performance of the program especially in more unequal and remote communities when targeting the poor greater coverage and a focus on high trust settings helped mitigate these concerns the findings highlight the continuing need for scrutiny when relying on decentralized targeting a clearer sense of purpose increasing productivity among poorer farmers versus increasing aggregate output could also enhance the targeting performance

input subsidy programs in sub saharan africa a synthesis of recent evidence input subsidy programs have once again become a major plank of agricultural development strategies in africa ten african governments spend roughly us 1 billion annually on input subsidy programs isps amounting to 28 6 of their public expenditures on agriculture this article reviews the microlevel evidence on isps undertaken since the mid 2000s we examine the characteristics of subsidy beneficiaries crop response rates to fertilizer application and their influence on the performance of subsidy programs the impacts of subsidy programs on national fertilizer use and the development of commercial input distribution systems and finally the impact of isps on food price levels and poverty rates the weight of the evidence indicates that the costs of the programs generally outweigh their benefits findings from other developing areas with a higher proportion of crop area under irrigation and with lower fertilizer prices factors that should provide higher returns to fertilizer subsidies than in africa indicate that at least a partial reallocation of expenditures from fertilizer subsidies to r d and infrastructure would provide higher returns to agricultural growth and poverty reduction however because isps enable governments to demonstrate tangible support to constituents they are likely to remain on the african landscape for the foreseeable future hence the study identifies ways in which benefits can be enhanced through changes in implementation modalities and complementary investments within a holistic agricultural intensification strategy among the most important of these are efforts to reduce the crowding out of commercial fertilizer distribution systems and programs to improve soil fertility to enable farmers to use fertilizer more efficiently the challenges associated with achieving these gains are likely to be formidable

the evolution of hyperbolic discounting implications for truly social valuation of the future abstract we explore the standard expected utility model and alternatives to it we then examine the behavioral and neurological evidence for hyperbolic discounting we discuss evidence related to the neurological and behavioral evolution of discounting in non human animals and in humans we explore new findings about the importance of sociality in human behavior and the implications for truly social time preference finally we discuss the implications of the neurological evidence on discounting for social environmental valuation in particular the implications for very long run decisions such as those involved in climate change mitigation and biodiversity preservation

optimal pricing and quality choice when investment in quality is irreversible this paper examines the price and quality choice of a single product risk neutral monopolist who can delay irreversible investments required for market entry it is shown that the price and quality she chooses at entry increase with uncertainty about the size of future demand in a stackelberg leader follower game the leader and follower pre commit immediately up to a certain level of uncertainty in this case the leader produces the higher quality good when uncertainty is higher than this threshold the follower will wait and enter the market later with a higher quality good

government fertilizer subsidy and commercial sector fertilizer demand evidence from the federal market stabilization program fmsp in nigeria abstract we examine how the previous fertilizer subsidy program in nigeria fmsp affected the demand for commercial fertilizer we apply an endogenous double hurdle model to a pseudo panel and cross section data of farm households the methodology accounts for potential endogeneity of commercial fertilizer price with subsidy our specification is also appropriate where few farmers report the use of both subsidized and commercial fertilizer we find that 100 kg of subsidized fertilizer supplied to a farm household reduced the probability of its participation into commercial fertilizer market by 10 21 points while not affecting fertilizer use upon participation

information goods vs industrial goods cost structure and competition we study markets for information goods and find that they differ significantly from markets for traditional industrial goods markets for information goods in which products are vertically differentiated lack the segmentation inherent in markets for industrial goods as a result a monopoly will offer only a single product competition leads to highly concentrated information good markets with the leading firm behaving almost like a monopoly even with free entry and without network effects we study how the structure of the firms cost functions drives our results this paper was accepted by barrie r nault information systems

rural nonfarm activities and agricultural crop production in nigeria although most rural households are involved in the farm sector the nonfarm sector has grown significantly in recent decades and its role in rural development has become increasingly important this article examines the effect of participation in nonfarm activities on crop expenses of farm households in nigeria the relationship is modeled using a nonseparable agricultural household model that suggests that participating in nonfarm activities can relax the credit constraints facing farm households and reduce risk thereby helping households improve farm production and smooth consumption over time the results show that participation in nonfarm activities by nigerian farmers has a positive and significant effect on crop expenses and in particular on payments for hired labor and inorganic fertilizers separate analysis of the six geopolitical zones in nigeria indicates that it is in the south south and south east zones where nonfarm participation appears to induce more hiring of labor the results support the hypothesis that nonfarm participation helps relax liquidity constraints but suggests how that liquidity is used is zone specific in general the results also indicate that liquidity is used more to pay for inputs into staple production as opposed to cash crops

how substitutable is natural capital one of the recurring themes in the sustainability literature has been the extent to which a loss of natural capital can be made up for in welfare terms by an increase in other forms of capital this issue was raised early on in the debate on sustainability by pearce and has never really been resolved this paper is an empirical attempt to measure the degree of substitutability between different forms of capital a nested ces production function is used to allow flexibility in the estimated elasticities of substitution also within this specification natural resources and other inputs are combined in different levels of the function thus allowing for different levels of substitutability institutional and economic indicators are also incorporated in the production function estimated results show that the elasticities derived from functions involving land resources were generally around one or greater implying a fairly high degree of substitutability furthermore changes in trade openness and private sector investment have a statistically significant and direct relationship on the efficiency of production and hence on income generation no statistically significant relationship between income and any of the institutional indicators was found

quality leadership when regulatory standards are forthcoming in many markets governments set minimum quality standards while some sellers compete on the basis of quality by exceeding them such quality leadership strategies often win public acclaim especially when they involve environmental attributes using a duopoly model of vertical product differentiation we show that if the high quality firm can commit to a quality level before regulations are promulgated it induces the regulator to weaken standards and welfare falls our results raise doubts about the social benefits of corporate self regulation and highlight the dangers of lengthy delays between legislative mandates for new regulations and their implementation

beyond gdp an overview of measurement issues in redefining wealth in the last decades a growing quantity of literature has been written about concepts such as quality of life and well being as a proxy for evaluating societal prosperity and progress this paper analyses the theoretical foundations and the empirical validity of multi dimensional technical tools that can be used for well being measurement there is no doubt that there is a lot of complexity and fuzziness inherent in multi dimensional concepts such as well being a possible reduction of this complexity a pre condition for policy making introduces the problem of the descriptors used indicators and indexes in a multi dimensional framework multi criteria evaluation is a consistent approach for the construction of so called composite indicators often some individual indicators improve while others deteriorate this is the classical conflictual situation dealt with in multi criteria evaluation in particular non compensatory methods are quite relevant since compensability implies complete substitutability between different types of capital uncertainty and sensitivity analysis can estimate the robustness of the results obtained and help the framing of the debate around the conceptual framework used that is which representation of reality and thus which societal values and interests has been considered

environmental policy in a green market this paper studies the impact of some frequently used environmental policies in a duopolistic market where purchasers are willing to pay more for less polluting goods when consumers differ in their environmental awareness a cleaner and a dirtier variant coexist in equilibrium the higher the average willingness to pay for the good the lower are variants unit emissions but the higher are industrial aggregate effluents a maximum unit emission standard reduces unit emissions of both variants but boosts firms sales and consequently increases industrial aggregate emissions as a result social welfare may be reduced we also explore the effects of technological subsidies and product charges including differentiation of charges

strategic policy for product r d with symmetric costs in this paper i examine strategic policy for product r d in an international duopoly where domestic and foreign firms are identical it is shown that strategic r d policy is described by a subsidy schedule contingent on firms quality choices unilateral policy enables its domestic firm to produce a high quality product making equilibrium outcome unique with two active governments in equilibrium they implement different subsidy schedules two equilibrium outcomes exist which are identical except for the identity of the countries thus both countries have an equal chance to become the high

non compensatory non linear composite indicators for ranking countries a defensible setting composite indicators or indexes are very common in economic and business statistics for benchmarking the mutual and relative progress of countries in a variety of policy domains such as industrial competitiveness sustainable development globalization and innovation the proliferation of the production of composite indicators by all the major international organizations is a clear symptom of their political importance and operational relevance in policy making as a consequence improvements in the way these indicators are constructed and used seem to be a very important research issue from both the theoretical and operational points of view this article aims at contributing to the improvement of the overall quality of composite indicators or indexes by looking at one of their technical weaknesses that is the aggregation convention used for their construction for this aim we build upon concepts coming from multi criteria decision analysis measurement theory and social choice we start from the

quality and quantity competition in a multiproduct duopoly author affiliation yi ling cheng ylcheng thu edu twshin kun peng speng econ sinica edu tw acknowledgment we are most grateful to three anonymous referees who generously offered a number of insightful comments to improve this article we have also benefited much from fruitful discussions with takatoshi tabuchi hong hwang and toshihiro matsumura which led to significant improvements in this article we are especially indebted to takatoshi tabuchi for his contributive comments and suggestions finally we would like to thank conference participants at 2010 association for public economic theory in istanbul society for the advancement of economic theory in singapore as well as seminar participants at institute of economics academia sinica and national taiwan university financial support from academia sinica and the national science council taiwan is gratefully acknowledged the usual disclaimer applies 1 introductionmost of the literature dealing with vertical product differentiation such as bonanno 1986 and motta 1993 assumes that each firm can produce only one product however multiproduct firms abound in the real world firms in various industries produce multiple quality differentiated goods for example mercedes benz provides three different classes of sedans namely its c class e class and s class and bmw has its 3 series 5 series and 7 series in addition both lenovo and sony supply around 20 kinds of laptops ranked in accordance with their central processing units and outfits 1a casual survey of the empirical evidence also suggests that any two multiproduct oligopolies usually differentiate the qualities of their products and the patterns of their quality differentiation can be classified into the segmented type and the nonsegmented type the former type implies that the products of one firm are always of higher quality and more highly priced than those of the other firm such as the sedans of bmw and honda all the sedans sold by bmw are more expensive and of higher quality than those of honda the latter type denotes completely different patterns where the products produced by the two firms have interlacing patterns of their prices qualities for example the prices of the mercedes benz c e and s classes are respectively 32 900 52 700 and 87 800 while the prices of bmw s 3 5 and 7 series are given as 33 600 45 800 and 80 300 respectively 2 the prices of their sedans are interlaced and it is inferred that their qualities are interlaced and nonsegmented other examples include the whiskey offered by johnnie walker and edrington and the plasma televisions provided by samsung and sony the nonsegmented patterns of differentiation between the multiproduct firms with similar technological capabilities are very common in reality however the related literature has not shed enough light studying them while the segmented type of quality differentiation has been characterized by champsaur and rochet 1989 1990 with a quality then price competition of multiproduct duopolists the nonsegmented one so far has not been captured and explained in the literature 3therefore this article intends to examine the equilibrium qualities as well as the number of products chosen by the multiproduct firms with identical similar technological capabilities such as mercedes benz and bmw our main purpose is to characterize the patterns of vertical product differentiation and to reveal the properties of quality differentiation between them the contributive articles gal or 1983 de fraja 1996 johnson and myatt 2003 2006 examine a variety quality and quantity competition between multiproduct firms 4 gal or 1983 de fraja 1996 and johnson and myatt 2003 proposition 6 conclude that firms with equal technological capabilities will compete head to head by producing identical products qualities

social multi criteria evaluation methodological foundations and operational consequences in order to address contemporary issues economics and decision sciences need to expand their empirical relevance by introducing more and more realistic thus more complex assumptions in their models one of the most interesting research directions in the field of public economics is the attempt to introduce political constraints interest groups and collusion effects explicitly j j laffont incentives and political economy 2000 the main argument developed here is the proposal of the concept of social multi criteria evaluation smce as a possible useful framework for the application of social choice to the difficult policy problems of our millennium where as stated by funtowicz and ravetz facts are uncertain values in dispute stakes high and decisions urgent this paper starts from the following main questions 1 why social multi criteria evaluation 2 how should such an approach be developed the foundations of smce are set up by referring to concepts from complex system theory and philosophy such as reflexive complexity post normal science and incommensurability to give some operational guidelines on the application of smce basic questions to be answered are 1 how is it possible to deal with technical incommensurability 2 how can we deal with the issue of social incommensurability to answer these questions using theoretical considerations and lessons learned from real world case studies is the main objective of the present article

measuring macroeconomic performance in the oecd a comparison of european and non european countries abstract we study the macroeconomic performance of 19 oecd countries over the period 1970 1990 performance is defined in terms of the ability of a country s macroeconomic managers to provide four services to their citizens a high level of real gdp per capita a low rate of inflation a low rate of unemployment and a favorable trade balance we use linear programming techniques to construct a best practice macroeconomic performance frontier and to measure the performance of each country in each year relative to the frontier we then add two environmental disamenities carbon and nitrogen emissions to the service list and repeat the analysis to see if the performance rankings change throughout the analysis emphasis is placed on a comparison of the performance of 14 european oecd countries with that of five non european oecd countries we find that performance rankings do change and that the relative performance of the european countries declines when the environmental disamenities are added to the service list

innovation and technology diffusion in competitive supply chains abstract innovations in consumer products frequently rely on technological advances across multiple tiers in a supply chain considering the consumer market demand and downstream investment conditions as input we model a game in a two tier supply chain where downstream firms choose to adopt different levels of an upstream technology and an upstream technology leader determines its pricing policy we identify two necessary but distinct elements for the successful development adoption and diffusion of upstream technologies that are sold to lower tiers as components within final products 1 the level of technology demanded by the market we develop a measure technological potential which describes the highest level of an upstream technology demanded by consumer markets 2 a sufficiently rich return to an upstream innovator as a function of different levels of technology from these two elements we show that the relative magnitudes of two competing sets of consumer market factors determine the technological potential whereas the overall magnitude of the factors in both sets determines the return to the upstream developer we discuss how this difference in consumer market factors influence on these two elements may determine how different technologies fare in the supply chain our results have managerial implications for investors in research and development project selection in identifying profitable technologies that are also demanded at higher capability levels and for governments in defining more targeted public policies for example in choosing the right tier of a supply chain to provide subsidies to encourage market support for certain technologies

strategic choice of quality when quality is costly the persistence of the high quality advantage in a two firm two stage model of vertical product differentiation i show that for every convex fixed cost function of quality the firm that chooses the higher quality at the first stage earns the higher profits the result holds for the pure strategy equilibrium in the simultaneous quality game and it holds as well if firms choose their qualities in sequential order

shifting fortunes the political economy of financial liberalization in nigeria abstract on the recommendation of the world bank nigeria began to liberalize its financial sector in 1986 contrary to the prediction of financial repression theory savings and investment decline in the wake of banking deregulation by 1995 the nigerian financial system was in a state of collapse the paper locates the main failure of nigeria s financial deregulation in the political and institutional setting of reform the institutional mechanisms needed to supervise and regulate banking under the new system were absent while private sector banking capacities were weak moreover financial liberalization was quickly captured by a clientalist state as a means of reallocating rents to strategic constituents an additional precipitating factor was macroeconomic instability the paper points to the importance of incorporating political and institutional variables into any model of financial reform or transformation

behavior based pricing production efficiency and quality differentiation in a two period vertical duopoly we examine how behavior based price discrimination bpd affects the firms endogenous quality differentiation and profits the firms relative production efficiency defined as the ratio between their unit cost difference and quality difference plays a crucial role with exogenous product qualities bpd always decreases the profits of the more efficient firm but increases those of the sufficiently less efficient firm anticipating its period 2 disadvantage in price discrimination the less efficient firm competes more vigorously and also gains more in period 1 than its competitor for the sufficiently less efficient firm its period 1 gain dominates its period 2 loss and its total profits increase with endogenous quality choices bpd does not alter the low end quality at the lower bound of the quality space but increases the high end quality enlarging quality differentiation this is because under bpd each firm s profit gain decreases or its profit loss increas

the economic and poverty impacts of maize research in west and central africa this article assembles the results of three multicountry surveys on variety performance and adoption patterns to measure the impacts of maize research in west and central africa from 1981 to 2005 and uses cost data since 1971 to compute social rates of return on public investments in maize research in the region adoption of modern varieties increased from less than 5 of the maize area in the 1970s to about 60 in 2005 yielding an aggregate rate of return on research and development r d investment of 43 the estimated number of people moved out of poverty through adoption of new maize varieties rose gradually in the 1980s to more than one million people per year since the mid 1990s over half of these impacts can be attributed to international maize research at iita and cimmyt the article concludes with a discussion of strategic options to enhance the impacts of maize research in the region

incumbent positioning as a determinant of strategic response to entry existing research has identified different firm characteristics that determine an incumbent s reaction toward market entrants this study widens the perspective from a firm s absolute attributes to its relative positioning within its competitive environment the hypotheses for the empirical analysis are derived from game theoretic models with either vertical or horizontal product differentiation in each of the two theoretical models two incumbents initially choose very different quality and variety levels respectively and move closer to the center when faced by entry of a competitor from the vertical differentiation model we predict a stronger price reduction by high quality firms in our empirical analysis we are using a novel dataset of the high quality restaurant market in germany to test the theoretical findings while the hypotheses with respect to adjustments of prices and varieties are supported we do not find empirical evidence for the predicted quality adjustment

risky quality choice abstract in vertical product differentiation with a stochastic research technology firms should target their research at different quality levels for efficiency in a natural monopoly where the top firm finds it most profitable to sell to the whole market the incentives for risk taking and for firms to differentiate their targeted qualities are optimal in a natural oligopoly which results when there is sufficient dispersion of tastes the relationship between a firm s payoff and its quality improvement over other firms is weakened this diminishes the firms incentives to differentiate and the targeted qualities are too low and too close together

capital theory and the measurement of sustainable development an indicator of weak sustainability the measurement of sustainable development is not without considerable difficulties yet this should not detract from the positive advances that can be made in this direction in this paper we present one form that a weak sustainability indicator can take derived from a simple but intuitive savings rule it incorporates the idea that the level of overall capital stock should be non decreasing although subject to qualification at this stage some interesting results emerge from the application of the rule to 18 countries

sequential versus simultaneous choice with endogenous quality abstract in this paper we examine how the timing of investment affects the levels of quality chosen by firms we show that in a model with vertical quality differentiation a game with sequential quality choice induces both firms to make smaller quality investments than they would in a game with simultaneous quality choice furthermore we show that while aggregate profit is higher both consumer and social surplus are lower under sequential quality choice

subsidies and crowding out a double hurdle model of fertilizer demand in malawi this article uses a double hurdle model with panel data from malawi to investigate how fertilizer subsidies affect farmer demand for commercial fertilizer the article controls for potential endogeneity caused by the nonrandom targeting of fertilizer subsidy recipients results show that on average 1 additional kilogram of subsidized fertilizer crowds out 0 22 kg of commercial fertilizer but crowding out ranges from 0 18 among the poorest farmers to 0 30 among relatively nonpoor farmers this indicates that targeting fertilizer subsidies to the rural poor is likely to maximize the contribution of the subsidy program to total fertilizer use

research note on the profitability of firms in a differentiated industry in a model of vertical differentiation the principal concern of this paper is to identify sufficient conditions for producing a higher or lower quality good to be more profitable in terms of profits and profit margin our basic model considers a short run scenario where the firms quality levels are fixed and they engage in price competition here our results are three first we develop the notion of relative cost efficiency and show that its increasing or decreasing monotonicity in product quality implies that of firm profitability in equilibrium a firm s relative cost efficiency refers to its quality adjusted cost dis advantage relative to its immediate competitors for a given distribution of consumer tastes second selling a higher quality good is more profitable when absolute cost efficiency defined as the ratio between a firm s quality and unit cost is increasing in quality third we also establish a set of lower and upper bounds on each firm s profitability the basic model is then extended in two directions we examine unit cost functions that demonstrate monotone profitability even when both quality and price are endogenous variables we also show that the spirit of relative cost efficiency and its associated sufficient condition hold valid for a logconcave consumer distribution

information and the provision of quality differentiated products governments often enact information provision policies to overcome asymmetric information of product qualities we show that increasing awareness among consumers of the quality of a good can but will not always encourage firms to produce goods with higher levels of quality even if product qualities increase social welfare may fall as information provision results in too much product differentiation we show that the effectiveness of emission taxes and output subsidies are affected by the level of consumer knowledge of product quality and we identify conditions under which information provision is welfare enhancing relative to these price instruments jel l15 q58 i introduction in the past 20 years consumers have become increasinglyconscious ofthe undesirable health and safety attributes of the products they consume and surveys suggest that a growing percentage of consumers are willing to pay more for higher quality products such as organic foods and household cleaners and detergents that contain less toxic ingredients guber 2003 other high quality products facing higher demand include energy efficient products like extended life lightbulbs and improved home insulation often these highquality products provide private benefits that are excludable to buyers as well as public benefits that are nonrival and nonexcludable for example reduced pesticide and chemical residue on food may lower the risk of cancer while also reducing contaminated run off that degrades ground and surface water quality extended life lightbulbs and improved home insulation may reduce an individual s utility bill while also reducing greenhouse gas emissions from lower energy consumption although interest in these types of high quality productsisgrowing demand isoften relatively small market shares of organic produce for

minimum quality standards and market dominance in vertically differentiated duopoly abstract the paper establishes conditions for low quality dominance within a vertically differentiated duopoly and studies the consequences for minimum quality standard policies gross surplus from unit consumption consists of a benefit from quality and a baseline benefit consumers are heterogeneous homogeneous with regard to the former latter marginal cost increases in quality the quality then price equilibrium exhibits low quality dominance first in market share and then in profit as baseline benefit increases relative to the willingness to pay for quality the preference structure determines the effect of a minimum quality standard in a way related to the pattern of dominance the standard reduces increases welfare under conditions that lead to low high quality dominance

disrupting demand for commercial seed input subsidies in malawi and zambia summary this study uses nationally representative household level panel data from malawi and zambia to identify the determinants of subsidized maize seed and fertilizer receipt and to estimate how input subsidies affect households commercial purchases of improved maize seed varieties in both countries we find that households in areas where the ruling party won the last presidential election acquire significantly more subsidized inputs than other households results also indicate that each additional kilogram of subsidized maize seed acquired by a household reduces its commercial improved maize seed purchases by 0 58 kg in malawi and by 0 49 kg in zambia on average

is increasing inorganic fertilizer use for maize production in ssa a profitable proposition evidence from nigeria inorganic fertilizer use across sub saharan africa is generally considered to be low yet the notion that fertilizer use is too low is predicated on the assumption that it is profitable to use rates higher than currently observed there is however limited empirical evidence to support this using a nationally representative panel dataset this paper empirically estimates the profitability of fertilizer use for maize production in nigeria we find that fertilizer use in nigeria is not as low as conventional wisdom suggests low marginal physical product and high transportation costs significantly reduce the profitability of fertilizer use apart from reduced transportation costs other constraints such as soil quality timely access to the product and availability of complementary inputs such as improved seeds irrigation and credit as well as good management practices are also necessary for sustained agricultural productivity improvements

a more timely and useful index of leading indicators effectively predicting cyclical movements in the economy is a major challenge the u s leading index li has long been used to analyze and predict economic fluctuations we describe and test a new procedure for making the li more timely the new li significantly outperforms its older counterpart it offers substantial gains in real time out of sample forecasts of changes in aggregate economic activity real gdp the index of coincident indicators and industrial production and provides timely and accurate ex ante information for predicting not only business cycle turning points but also monthly changes in the economy

a comment on a model of vertical product differentiation in a duopoly model with vertical differentiation if the firms do not cover the market the lower quality firm chooses a quality level exactly 4 7 of that of the higher quality firm and chooses a price that is 2 7 of the price of the higher quality firm copyright 1992 by blackwell publishing ltd

robust multidimensional poverty comparisons we demonstrate how to make poverty comparisons using multidimensional indicators of well being showing in particular how to check whether the comparisons are robust to aggregation procedures and to the choice of multidimensional poverty lines in contrast to earlier work our methodology applies equally well to what can be defined as union intersection or intermediate approaches to dealing with multidimensional indicators of well being to make this procedure of some practical usefulness the paper also derives the sampling distribution of various multidimensional poverty estimators including estimators of the critical poverty frontiers outside which multidimensional poverty comparisons can no longer be deemed ethically robust the results are illustrated using data from a number of developing countries

vertical product differentiation with entry abstract this paper examines the non cooperative behaviour of established firms that compete in product quality and prices while foreseeing the effects of their rivalry on the decisions made by the later entrants we prove an existence and uniqueness of the equilibrium and show that the dominant firms engage in maximal product differentiation i e select the highest and lowest technologically feasible qualities later entrant however always selects an intermediate quality moreover we show that the equilibrium configuration is identical to that generated by perfect foresight equilibrium in a model of sequential entry furthermore the profits earned by each firm are ranked in the same order as the qualities implifying that the later entrant despite being the last mover ends up with higher profits and larger market share than one of the incumbents

weak comparability of values as a foundation for ecological economics the main argument of this paper is that weak comparability of values should be seen as one characteristic feature of ecological economics the formal properties of the concepts of strong comparability implying strong or weak commensurability and weak comparability implying incommensurability will be clarified multicriteria evaluation offers the methodological and mathematical tools to operationalize the concept of incommensurability at both macro and micro levels of analysis the concept of incommensurability of values already has a long tradition in economics moreover we will show that analytic philosophy theories of complexity post normal science and the recent theories of rationality lead with different trajectories to a non algorithmic approach which in our view could be implemented by some forms of multicriteria evaluation 1998 elsevier science b v all rights reserved

hidden linkages between resources and economy a beyond gdp approach using alternative welfare indicators taking gdp as the standard economic indicator for economic welfare recent resources economy studies indicate the dematerialization of the economy the so called decoupling effect this conclusion seems to alleviate concerns over resource scarcity and limits to growth and feeds optimism for green growth and sustainability prospects however the validity of gdp as the sole and unambiguous measure of the ultimate outcome of the economy has been severely disputed there is nowadays increasing interest in broader welfare measurements that capture more aspects of economic output and hence constitute better approximations of well being the present paper provides an overview of the above discussion and sets out to explore the relevance of three alternative welfare indicators the human development index hdi the index of sustainable economic welfare isew and the genuine progress indicator gpi as a basis for evaluating the dependency of welfare and its major engine the economy on natural resources increasing welfare appears to require a disproportionate use of resources strong and increasing dependency on resources at the global level and in giant countries such as china and india may have serious implications for current sustainability policies and the united nations sustainable development goals

low quality leadership in a vertically differentiated duopoly with cournot competition abstract we model a vertically differentiated duopoly with quantity setting firms as an extended game in which firms noncooperatively choose the timing of moves at the quality stage to show that at the subgame perfect equilibrium sequential play obtains with the low quality firm taking the leader s role

an analysis of the s p 500 index and cowles s extensions price indexes and stock returns 1870 1999 this article provides a consistent monthly stock price index from january 1871 through 1999 the broadly defined s p weekly index is reconstructed from 1918 and carried forward as the s p 500 composite index to the present cowles s monthly index is improved in order to provide month end estimates from february 1885 cowles s estimates of dividends and earnings for this index from 1871 are reevaluated and are carried forward until spliced to the s p daily estimates that began in 1957 the result is a monthly index of prices dividends and earnings based on consistent definitions over a period of 130 years

fertilizer subsidies political influence and local food prices in sub saharan africa evidence from nigeria abstract the last decade has seen a resurgence in the use of fertilizer subsidies in sub saharan africa however there is limited empirical evidence on the effects of fertilizer subsidy programs on local food prices using an instrumental variables approach we explore the effect of a fertilizer subsidy program on the seasonal growth rates of grain prices in nigeria our results suggest that the fertilizer subsidy program had very small effects on the growth rates of grain prices between the post planting and post harvesting seasons we also find that political influence played a role in the distribution of subsidized fertilizer we discuss how the weak effects on the price growth rates may be caused by low market orientation output market structures greater focus on farmers incomes low marginal productivity of fertilizer and politically influenced targeting

lowering customer evaluation costs product differentiation and price competition when match uncertainty is resolved via costly evaluation the first product sampled by a customer is more likely to make the sale this prompts firms to lower their products evaluation costs to attract customers to sample their products first such efforts by firms are called customer learning investment cli when product quality is freely observable but horizontal match is not we examine how cli choices interact with quality and price competition in a duopoly cli has a competition effect in that a higher cli of a firm increases its demand but decreases that of its rivals in the market covered duopoly both qualities will decrease increase when the high end low end firm invests more in customer learning and remain unchanged when they invest equally relative to when neither firm invests we further show that the firm with a higher relative production efficiency invests more in customer learning than the competitor in the market not covered duopoly cli by the low end firm also creates a market

impacts of community driven development programs on income and asset acquisition in africa the case of nigeria summary this study evaluates the impacts of a community driven development cdd project on household income and acquisition of productive assets in nigeria using recall data difference in differences and propensity score matching approaches the study finds that the project succeeded in targeting the poor and women farmers in its productive asset acquisition component participation in the project also increased the mean income of beneficiaries by about 40 60 but the impact of the project on income of the poorest beneficiaries was not statistically significant additionally sustainability of this achievement is uncertain since the project did not involve rural credit services the large cash transfer through its productive asset acquisition component is also unsustainable future studies should be undertaken using longer term panel data to capture the pattern and trend of the impact of this project

certification and minimum quality standards when some consumers are uninformed we compare certification to a minimum quality standard mqs policy in a duopolistic industry where firms incur quality dependent fixed costs and only a fraction of consumers observe the quality of the offered goods compared to the unregulated outcome both profits and social welfare would increase if firms could commit to producing a higher quality an mqs restricts the firms quality choice and leads to less differentiated goods this fuels competition and may therefore deter entry a certification policy which awards firms with a certificate if the quality of their products exceeds some threshold does not restrict the firms quality choice in contrast to an mqs certification may lead to more differentiated goods and higher profits we find that firms are willing to comply with an ambitious certification standard if the share of informed consumers is small in that case certification is more effective from a welfare perspective than a minimum quality standard because it is less detrimental to entry

do input subsidy programs crowd in or crowd out commercial market development modeling fertilizer demand in a two channel marketing system many governments in developing countries distribute fertilizer at subsidized prices in an effort to stimulate small farmers agricultural productivity and food security prior fertilizer demand studies have largely failed to account for the effects of government programs on farmers commercial purchases using a double hurdle model and nationally representative rural household panel data in zambia we distinguish between these sources and measure the contemporaneous crowding in and crowding out effects of government input programs on commercial fertilizer sales where the private sector is relatively active and average wealth is higher areas seemingly more likely to be targeted by government programs results indicate that subsidies have substantially crowded out the private sector in some cases to the point that such programs could actually lower overall fertilizer use on the other hand in poorer areas where the private sector is relatively inactive subsidies help to generate demand and crowd in private sector retailers empirical studies explicitly modeling farmers fertilizer purchase behavior within a dual marketing framework can provide important insights for agricultural policy discussions in developing countries

productivity and welfare effects of nigeria s e voucher based input subsidy program summary in an attempt to go beyond the so called smart subsidies nigeria has embarked on a potentially innovative mobile phone based input subsidy program that provides fertilizer and improved seed subsidies through electronic vouchers in this article we examined the productivity and welfare effects of the program using household level data from rural nigeria the article employed instrumental variable regression approach to control for the potential endogeneity of the input subsidy program our results suggest that the program is effective in improving productivity and welfare outcomes of beneficiary smallholders the size of the estimated effects suggests a large improvement in productivity and welfare outcomes moreover the distributional effects of the program suggest no heterogeneity effects based on gender and farm land size these results are robust to using alternative measurements of program participation the benefit cost ratio of 1 11 suggests that the program is marginally cost effective overall our results suggest that while improving average productivity is a good outcome for improving food security improving the distributional outcome of the program by targeting the most disadvantaged groups would maximize the program s contribution to food security and poverty reduction

endogenous quality choice price vs quantity competition two versions of a vertical product differentiation model one with fixed and the other with variable costs of quality are analyzed to study how the hypotheses of price versus quantity competition affect equilibrium solutions product differentiation arises under all the scenarios considered contrasting previous findings of symmetric quality choices under cournot behavior however to relax harsher market competition firms differentiate more under bertrand than under cournot a simple welfare measure also indicates that the economy is better off when firms compete on prices with fixed costs of quality not only consumer but also producer surplus is higher under price competition copyright 1993 by blackwell publishing ltd

setting quality expectations when entering a market what should the promise be this paper examines optimal advertised quality actual quality and price for a firm entering a market it develops a two period model where advertised quality influences expectations and hence trial and the gap between actual quality and expectations determines satisfaction which in turn impacts second period sales in such situations a company makes a choice between advertising high quality and getting trial but little repeat and advertising low quality and getting low trial but high repeat results are derived by numerical methods as well as analytically for a special case of the model the model suggests it is optimal to overstate quality when i customers rely relatively less on advertising to form quality expectations and ii customers intrinsic satisfaction with a product is high these results are consistent with deceptive advertising cases at the ftc which showed more deception for unknown firms and for firms whose customers were more satisfied they are also consistent with the decisions made by future managers mbas except that the respondents would advertise higher versus lower quality when advertising was effective

the conditions for achieving environmentally sustainable development this paper is interested in the narrower interpretation the relationship between environmental quality and sustainable economic activity the latter is interpreted as that level of economic activity which leaves the environmental quality level intact with the policy objective corresponding to this notion being the maximization of net benefits of economic development subject to maintaining the services and quality of natural resources over time 3

trade policy and quality leadership in transition economies trade policy and quality leadership in transition economies are analyzed in a duopoly model of trade and vertical product differentiation we first show that the incidence of trade liberalization is sensitive to whether firms in transition economies are producers of low or high quality second we find that neither free trade nor the absence of a domestic subsidy are optimal both a tariff and a subsidy increase price competition and while the former extracts foreign rents the latter results in quality upgrading third there exists a rationale for a government to commit to a socially optimal policy to induce quality leadership by the domestic firm when cost asymmetries are low finally we establish an equivalence result between the effects of long run exchange rate changes and those of trade policy on price competition but not on social welfare

exit with vertical product differentiation abstract this paper presents a duopoly model of exit from a declining industry with vertical product differentiation it extends previous io models on exit that have so far ignored demand effects the model shows how the interplay between demand and technological factors determine the order of exit therefore demand factors are relevant and should be taken into account thus the firm with a longer tenure as a profitable monopolist does not necessarily outlast its rival in addition this paper argues that the low quality firm may find it optimal to stay in the market despite making temporary losses to outlast its rival