position auctions with consumer search this paper examines a model in which advertisers bid for sponsored link positions on a search engine the value advertisers derive from each position is endogenized as coming from sales to a population of consumers who make rational inferences about rm qualities and search optimally consumer search strategies equilibrium bidding and the welfare benets of position auctions are analyzed implications for reserve prices and a number of other auction design questions are discussed

market frictions a unified model of search costs and switching costs it is well known that search costs and switching costs can create market power by constraining the ability of consumers to change suppliers while previous research has examined each cost in isolation this paper demonstrates the benefits of examining the two types of friction in unison the paper shows how subtle distinctions between the two costs can provide important differences in their effects upon consumer behaviour competition and welfare in addition the paper also illustrates a simple empirical methodology for estimating separate measures of both costs while demonstrating a potential bias that can arise if only one cost is considered

multidimensional mechanism design for auctions with externalities abstract in an auction with externalities a buyer s type is multidimensional and specifies the payoff he would get for each of the n 1 possible outcomes the seller keeps the object or buyer i i 1 n gets the object we provide a characterization of multidimensional incentive compatible mechanisms similar to that for one dimensional mechanisms although reservation utilities are endogenous and type dependent the participation constraint is binding for only one critical type a main difficulty in a multidimensional setting is the integrability condition we present a geometric characterization for discontinuous conservative vector fields in auctions where the buyers submit scalar bids and the seller transfers the object to one of the buyers for sure a second price auction maximizes revenue with two buyers this auction remains optimal even if the seller can set a reservation price journal of economic literature classification numbers c7 c72

incentive compatibility in non quasilinear environments we derive several implications of incentive compatibility in general i e not necessarily quasilinear environments building on kos and messner 2013 we provide a partial characterization of incentive compatible mechanisms

pricing prototypical products when we think of colas coca cola first comes to mind products such as cola cola tide laundry detergent and chapstick lip balm are the prototypical products in their respective categories for more than three decades research in consumer psychology has accumulated evidence on how prototypicality influences memory shapes the composition of consideration set and affects purchase decision yet there is no research on how it changes the competitive behavior of firms in a horizontally differentiated market for example some prototypical products are priced lower than other products in their category whereas in certain other categories the prototypical product is priced higher we propose a novel model of spatial competition where the prototypicality of a product influences the probability of the product being included in consumers consideration sets without affecting its valuation using the model we examine theoretically the impact of prototypicality on the pricing decisions of competing firms our analysis shows that when consumer valuations are low the prototypical product is priced lower than a nonprototypical product and earns more profits however when consumer valuations are high the rank order of the prices of the prototypical product and a nonprototypical product is reversed but not the order of profits we subject these predictions to an empirical test the experimental results lend support for the qualitative predictions of the model

how not to sell nuclear weapons we consider situations where a sale affects the ensuing interaction between potential buyers these situations are modeled by assuming that an agent who does not acquire the object for sale incurs an identity dependent externality we construct a revenue maximizing auction for the seller we observe that 1 outside options and participation constraints are endogenous 2 the seller extracts surplus also from agents who do not obtain the auctioned object 3 the seller is better off by not selling at all while obtaining some payments if externalities are much larger than valuations

price directed consumer search abstract we extend stahl s 1989 model to a setting with differentiated products to study the effects of price directed consumer search consumers engage in costly search to find out whether products meet their needs consumer search is directed by prices when they are observable before search in contrast to the case in which prices are discovered only after search where search is naturally random the equilibrium under price directed search differs substantially from that under random search despite certain similarities we show that as search costs decrease sales become more likely and firms earn higher expected profits under price directed search whereas the opposite holds under random search moreover compared with random search under price directed search firms expected profits are always lower but consumer surplus and total welfare are higher provided that the search cost is sufficiently small

prominence complexity and pricing this paper analyzes prominence in a homogeneous product market where two firms simultaneously choose both prices and price complexity levels complexity limits competing offers comparability and results in consumer confusion confused consumers are more likely to buy from the prominent firm in equilibrium there is dispersion in both prices and price complexity the nature of equilibrium depends on prominence compared to its rival the prominent firm makes higher profit associates a smaller price range with lowest complexity puts lower probability on lowest complexity and sets a higher average price however higher prominence may benefit consumers and conditional on choosing lowest complexity the prominent firm s average price is lower which is consistent with confused consumers bias

implementability walrasian equilibria and efficient matchings abstract in general screening problems implementable allocation rules correspond exactly to walrasian equilibria of an economy in which types are consumers with quasilinear utility and unit demand due to the welfare theorems an allocation rule is implementable if and only if it induces an efficient matching between types and goods

the dynamics of agglomeration externalities along the life cycle of industries neffke f henning m boschma r lundquist k j and olander l o the dynamics of agglomeration externalities along the life cycle of industries regional studies this paper investigates the changing roles of agglomeration externalities along the industry life cycle it is argued that industries have different agglomeration needs in different stages of their life cycles because their mode of competition innovation intensity and learning opportunities change over time for twelve swedish manufacturing industries it is determined for each year between 1974 and 2004 whether the industry is in a young intermediate or mature stage whereas marshall arrow romer mar externalities steadily increase with the maturity of industries the effects of local diversity jacobs externalities are positive for young industries but decline and even become negative for more mature industries neffke f henning m boschma r lundquist k j et olander l o la dynamique des effets externes d agglomeration tout

a theory of disappointment aversion an axiomatic model of preferences over lotteries is developed it is shown that this model is consistent with the allais paradox includes expected utility theory as a special case and is only one parameter beta richer than the expected utility model allais paradox type behavior is identified with positive values of beta preferences with positive beta are said to be disappointment averse it is shown that risk aversion implies disappointment aversion and that the arrow pratt measures of risk aversion can be generalized in a straight forward manner to the current framework copyright 1991 by the econometric society

industry specific firm growth and agglomeration duschl m scholl t brenner t luxen d and raschke f industry specific firm growth and agglomeration regional studies this paper analyses the industry specific relationship between industrial clustering and firm growth micro geographically defined agglomeration measures based on travel time distances and a flexible log logistic decay function framework are used to study the spatial impacts of related economic and knowledge generating activities in 23 industries it is found that firms growth prospects tend to be generally hampered by the agglomeration of own industry employment whereas the impact of proximate scientific activities systematically depends on the kind and age of industry furthermore the optimal specifications of decay function that measures agglomeration effects considerably vary between both the industrsssies and the variables

consumer search with observational learning this article studies observational learning in a consumer search environment consumers observe the purchasing decision of a predecessor with similar preferences consumers rationally emulate by initiating their search at the firm from which their predecessor purchased free riding on search effort and reacting less to price changes prices are nonmonotone in search costs and may be as low as marginal costs we discuss several extensions and show that the effect of emulation on prices is stronger when i the number of firms increases ii consumers first visits are more elastic with respect to market shares and iii prices are adjusted more frequently

the interactive effects of human capital and quality of life on economic growth abstractto bridge the gap in the quality of life qol and economic growth literature and understand the reinforcing effects of qol and human capital on economic development we examine the interactive effects of these two factors on wage growth from 2000 to 2007 at the county level across the united states first a rosen roback model is employed to estimate implicit values of amenities including climate clean air and other natural attributes which are used to generate qol indices second qol human capital represented by the share of college graduates and their interaction serve as key variables in the wage growth model an instrumental variable approach and location fixed effects are used to address endogeneity of human capital and control for location specific unobservable characteristics results suggest that human capital and qol significantly contribute to economic growth and the growth effects are even larger in nonmetropolitan counties importantly we find that the effect of human capital on

time scarcity and the market for news abstract we develop a theory of news coverage in environments of information abundance time constrained consumers browse through news items across competing outlets they choose which outlets to access and which stories to read or skip thus indirectly deciding how much time to spend on a given outlet firms decide on rankings of news items that maximize their profits we show that even when readers or television viewers and firms are rational and unbiased they spend more time on the news than they would like and not necessarily on the topics they prefer in particular relevant news items may be crowded out we then study how reader efficient standards can be restored and derive implications on diverse aspects of new and traditional media these include tabloidization and polarization of the news and other aspects relevant for the political economy of the media including political knowledge gaps and voter turnout

do spinoff dynamics or agglomeration externalities drive industry clustering a reappraisal of steven klepper s work steven klepper s theory of industry clustering based on organizational reproduction and inheritance through spinoffs challenged the marshallian view on industry clustering this article provides an assessment of klepper s theoretical and empirical work on industry clustering we explore how new his spinoff theory on industry clustering was and we investigate the impact of klepper s theory on the economic geography community klepper s work has inspired especially recent literature on regional branching that argues that new industries grow out of and recombine capabilities from local related industries finally the article discusses what questions on industry location are still left open or in need of more evidence in the context of klepper s theory less

consumer search with asymmetric price sampling we explore asymmetries in the way consumers sample prices in a simple sequential search framework in equilibrium the price distribution of a firm catering to more local consumers first order stochastically dominates that of its rival prices rise in the degree of asymmetry

scale externalities in korea this paper estimates the nature and magnitude of scale externalities in a developing country korea in the period 1983 1993 this is a period of rapid industry deconcentration from seoul to other metro areas providing a context where externalities are measured when local scale magnitudes are changing dramatically the data allow us to examine the emerging degree of national industrial concentration in different industries as related to their scale externality magnitudes we also examine whether individual industries agglomerate in cities which have a comparative advantage for that industry

price discrimination and social welfare studies the effect of price discrimination on social welfare using methods from duality theory features of the reservation model presented quasi linear utility and consumers surplus upper and lower bounds on welfare change bounds on welfare change with optimal price discrimination from ebsco

optimal search for product information consumers often need to search for product information before making purchase decisions we consider a tractable continuous time model of gradual learning in which consumers incur search costs to learn further product information and update their expected utility of the product at each search occasion we characterize the optimal stopping rules for either purchase or no purchase as a function of search costs and of the importance informativeness of each attribute this paper also characterizes how the likelihood of purchase changes with the ex ante expected utility search costs and the importance informativeness of each attribute we discuss optimal pricing the impact of consumer search on profits and social welfare and how the seller chooses its price to strategically affect the extent of the consumers search behavior we show that lower search costs can hurt the consumer because the seller may then choose to charge higher prices discounting creates asymmetry in the purchase and no purchase search thresholds and may lead to lower prices if search occurs in equilibrium or higher prices if there is no search in equilibrium this paper also considers searching for signals of the value of the product heterogeneous importance of attributes endogenous intensity of search and social learning this paper was accepted by pradeep chintagunta marketing

coordination economies advertising and search behavior in retail markets we introduce a model of the retail firm in which consumers and active firms benefit collectively from coordination of sales at fewer firms using this model we show that ostensibly uninformative advertising plays a key role in bringing about coordination economies by directing consumer search toward firms that offer the best deals optimal consumer search takes the form of a simple rule of thumb that uses observed advertising information to guide search both industry concentration and social surplus are higher in the presence of advertising relative to a no advertising benchmark jel d83 l15 many observed advertisements seem to be at odds with rational behavior in a variety of ads mostly on tv and radio multiproduct sellers provide little hard information choosing instead to impart only vague slogans that are suggestive of good deals examples are plentiful a hardware store

in google we trust we examine the incentives of a monopolistic search engine funded by advertising to provide reliable search results we distinguish two types of search results sponsored and organic not paid for organic results are most important in searches for online content while sponsored results are more important in product searches by modeling the underlying markets for online content and offline products we can identify the sources of distortions for each type of result and their interaction this explicit treatment proves crucial for understanding not only spillovers across markets but also fundamental policy issues such as the welfare effects of integration in particular integration of the engine with a small fraction of content providers is welfare enhancing when incentives to distort are stronger for sponsored than organic search but welfare reducing in the opposite case

why not greater catch up by chinese firms the impact of ipr corporate governance and technology intensity on late comer strategies abstract how can late comer firms lcfs in developing economies manage their development of technological capability and within it their ip strategically in order to become fully competitive internationally under what conditions external and internal are they likely to succeed this paper develops a theoretical framework for understanding lcfs technology strategy and predicting its outcome then applies it to the cases of three chinese firms in sectors at different levels of technology intensity this yields insights as to its limitations and further development these help explain mainland china s very limited catch up in high technology sectors and to a lesser extent in medium high technology we show how our findings can be reconciled with the much greater success of korean firms some 20 years earlier if the effect of corporate governance differences is recognised

related variety unrelated variety and technological breakthroughs an analysis of us state level patenting castaldi c frenken k and los b related variety unrelated variety and technological breakthroughs an analysis of us state level patenting regional studies this paper investigates how variety affects the innovation output of a region borrowing arguments from theories of recombinant innovation it is expected that related variety will enhance innovation as related technologies are more easily recombined into a new technology however it is also expected that unrelated variety enhances technological breakthroughs since radical innovation often stems from connecting previously unrelated technologies opening up whole new functionalities and applications using patent data for us states in the period 1977 99 and associated citation data evidence is found for both hypotheses this study thus sheds a new and critical light on the related variety hypothesis in economic geography

a model of recommended retail prices manufacturers frequently post nonbinding public price recommendations but neither the rationale for this practice nor its impact on prices is well understood i develop a model in which recommendations signal a manufacturer s production cost to searching consumers who then form beliefs about retail prices increasing search makes consumers reject offers for the manufacturer s and competitors products more often and i show that both consumers and the manufacturer prefer more search when the production cost is low and less search when it is high with incentives thus aligned manufacturer recommendations inform consumers via cheap talk and their removal harms both parties

group learning wage dispersion and non stationary offers can differences in equilibrium beliefs among otherwise identical individuals account for a substantial degree of wage inequality this paper shows that this is possible if two conditions are met first people learn about the distribution of wage offers from the experience of their peers and second people believe that wage offers are stationary even though offers that arrive later tend to have higher wages than offers that arrive earlier peer groups can then end up with different stable beliefs that lead to intergroup wage differences the non stationarity of offers is rationalized in a model where firms can either advertise their job openings or not and where advertised ones have more influence on more inexperienced job searchers a statistic is proposed whose application to existing studies suggests that the non stationarity considered here is present in data

inverted u relationship between r d intensity and survival evidence on scale and complementarity effects in uk data existing evidence on the relationship between rd ii rd and iii creative destruction as proxied by median r d intensity in the industry and the premium on business lending have negative effects on firm survival other findings concerning age size productivity relative growth pavitt technology classes and the macroeconomic environment are in line with the existing literature the results are strongly or moderately robust to different samples stepwise estimations and controls for frailty and left truncation

mechanism design without revenue equivalence abstract we study mechanism design problems in quasi linear environments where the envelope theorem and revenue equivalence principle fail due to non convex and non differentiable valuations we obtain a characterization of incentive compatibility based on the mirrlees representation of the indirect utility and a monotonicity condition on the allocation rule which pin down the range of possible payoffs as a function of the allocation rule to illustrate our approach we derive the optimal selling mechanism in a buyer seller situation where the buyer is loss averse we find a budget balanced efficient mechanism in a public goods location model and we consider a principal agent model with ex post non contractible actions available to the agent

price competition with satisficing consumers abstract the satisficing heuristic by simon 1955 has recently attracted attention both theoretically and experimentally in this paper i study a price competition model in which the consumer is satisficing and firms can influence his aspiration price via marketing unlike existing models whether a price comparison is made depends on both pricing and marketing strategies i fully characterize the unique symmetric equilibrium by investigating the implications of satisficing on various aspects of market competition the proposed model can help explain well documented economic phenomena such as the positive correlation between marketing and prices observed in some markets

online shopping and platform design with ex ante registration requirements we study platform design in online markets in which buying involves a nonmonetary cost for consumers caused by privacy and security concerns firms decide whether to require registration at their website before consumers learn relevant product information we derive conditions under which a monopoly seller benefits from ex ante registration requirements and demonstrate that the profitability of registration requirements is increased when taking into account the prospect of future purchases or an informational value of consumer registration to the firm moreover we consider the effectiveness of discounts store credit as a means to influence the consumers registration decision finally we confirm the profitability of ex ante registration requirements in the presence of price competition the online appendix is available at https doi org 10 1287 mnsc 2016 2595 this paper was accepted by j miguel villas boas marketing

an empirical model of search with vertically differentiated products this paper presents a nonsequential search model that allows for vertical product dierentiation in the unique symmetric equilibrium firms with dierent characteristics draw utilities from a common utility distribution because the firms dier in their characteristics this leads to dierent price distributions the model therefore provides a theoretical rationale for explaining price dispersion as a result of quality dierences and search behavior of consumers together using the equilibrium conditions derived from the model it is shown how to estimate search costs by maximum likelihood using only price data a data set on prices from dutch supermarkets reveals that the amount of search has decreased over the sampling period moreover ignoring vertical product dierentiation results in an overestimation of search costs

uncertain demand consumer loss aversion and flat rate tariffs we consider a model of firm pricing and consumer choice where consumers are loss averse and uncertain about their future demand possibly consumers in our model prefer a flat rate to a measured tariff even though this choice does not minimize their expected billing amount a behavior in line with ample empirical evidence we solve for the profit maximizing two part tariff which is a flat rate if a marginal costs are not too high b loss aversion is intense and c there are strong variations in demand moreover we analyze the optimal nonlinear tariff this tariff has a large flat part when a flat rate is optimal among the class of two part tariffs

beliefs and consumer search in a vertical industry this paper studies vertical relations in a search market as the wholesale arrangement between a manufacturer and its retailers is typically unobserved by consumers their beliefs about who is to be blamed for a price deviation play a crucial role in determining wholesale and retail prices the common assumption in the consumer search literature is that consumers exclusively blame an individual retailer for a price deviation we show that in the vertical relations context predictions based on this assumption are not robust in the sense that if consumers assign just a small probability to the event that the upstream manufacturer is responsible for the deviation equilibrium predictions are qualitatively di erent for the robust beliefs the vertical model can explain a variety of observations such as retail price rigidity or alternatively low cost pass through non monotonicity of retail prices in search costs and seemingly collusive retail behavior the model can be used to study a monopoly online platform that sells access to nal consumers

informative price advertising in a sequential search model the purpose of this paper is to study the role and implications of price advertising when shopping trips are costly to consumers to do so we introduce advertising into an optimal sequential search model information about prices is both gathered by consumers and disseminated by firms consumers search sequentially and stores advertise with various intensity when it is in their interest to do so our model has a unique equilibrium exhibiting priee dispersion the model generates predictions about the shape of the price distribution and firms advertising behavior we explore the effects of entry and find that when initial advertising costs at zero level of effort are precisely zero entry drives the equilibrium to the perfectly competitive outcome however when initial marginal advertising costs are positive entry drives prices higher and while the informed consumers almost surely locate competitive prices welfare does not necessarily increase finally we compare the effectiveness of the two informational channels when advertising costs shrink prices become competitive however when search costs shrink prices remain bounded above marginal production costs

technology intensity and agglomeration economies abstract this article investigates the relationship between industry technology intensity and the impacts of agglomeration economies on industrial growth many recent studies suggest the actual economic impacts of different forms of agglomeration economies depend on industrial characteristics such as technology intensity but systematic empirical evidence is still lacking to fill this gap we analyze employment data covering all 3 digit naics industries of u s counties the results confirm that technology intensive industries are more likely to benefit from jacobs spillovers as measured by related variety while sectors with low technology intensities can better benefit from mar spillovers as measured by regional specialization

information cost and consumer choices of healthy foods this article examines whether or not a reduction in consumer search cost for nutritional information increases the probability that heterogeneous consumers will choose healthier food products empirical results from the ready to eat breakfast cereal rtec market confirm the conceptual analysis that lowering information cost via simplified nutritional labeling increases the healthfulness of consumer choices the healthfulness attribute weighs 28 44 more heavily in consumers decision making with simpler labeling systems on average introducing front of package labeling increased the probability of a consumer choosing a healthy rtec by 3 49 and reduced the probability of choosing an unhealthy rtec by 3 81 calories sugar saturated fat and sodium consumption decrease by 0 31 2 63 6 94 and 1 97 respectively fiber intake increases by 3 24 further results show that less educated and smaller households with less frequent purchases benefit the most from a reduction in information cost overall this article shows the potentially positive role that voluntary more convenient labeling could play in improving market and public health outcomes

pricing product diversity and search costs a bertrand chamberlin diamond model we study price competition in the presence of search costs and product differentiation the limit cases of the model are the bertrand paradox the diamond paradox and chamberlinian monopolistic competition market prices rise with search costs and decrease with the number of firms prices may initially fall with the degree of product differentiation because more diversity leads to more search and more competition equilibrium diversity rises with search costs while the optimum level falls so entry is excessive the market failure is most pronounced for low preference for variety and high search costs

a simple model of search engine pricing we present a simple model of how a monopolistic search engine optimally determines the average relevance of firms in its search pool in our model there is a continuum of consumers who use the search engine s pool and there is a continuum of firms whose entry to the pool is restricted by a price per click set by the search engine we show that a monopolistic search engine may have an incentive to set a relatively low price per click that encourages low relevance advertisers to enter the search pool in general the ratio between the marginal and average relevance in the search pool induced by the search engine s policy is equal to the ratio between the search engine s profit per consumer and the equilibrium product price these conclusions do not change if the search engine charges a fixed access fee rather than a price per click a search engine is a platform that serves a two sided market it is based on a technology that potentially improves the quality of consumer search before the advent of internet search engines yellow pages were the closest example of a search engine firms pay to be included in the yellow pages with various degrees of prominence the yellow pages organise the set of firms according to some categorisation system in internet environments consumers use search engines by submitting a query in a language dictated by the search engine the objects that the query elicits depend on the search engine s

optimal auction design in two sided markets a key feature of online markets for advertising e g sponsored links is that clicking rates depend on the searchers expectations that the platform selects relevant advertisers this article studies auction design by a platform that maximizes profits in the long run where clicking rates are mechanism dependent in line with the practice of the major search engines the revenue maximizing mechanism is a scoring auction that combines the willingness to pay and the relevance to searchers of advertisers by trading off rent extraction and clicking volume this mechanism works as a cross subsidization device between searchers and advertisers

revisiting marshall s agglomeration economies technological relatedness and the evolution of the sheffield metals cluster potter a and watts h d revisiting marshall s agglomeration economies technological relatedness and the evolution of the sheffield metals cluster regional studies according to alfred marshall firms receive increasing returns from a trinity of agglomeration economies a local pool of skilled labour local supplier linkages and local knowledge spillovers this article re examines the mechanisms underlying marshall s agglomeration economies in the sheffield metals cluster wherein marshall discovered them despite the cluster s decline empirical evidence is found that the mechanisms underlying marshallian agglomeration economies continue to occur within the surviving metals industry however upon closer examination marshallian agglomeration economies have evolved to become more prevalent amongst plants that use related metals technology the results highlight the importance of technological relatedness to cluster survival

prominence and consumer search this article examines the implications of prominence in search markets we model prominence by supposing that the prominent firm will be sampled first by all consumers if there are no systematic quality differences among firms we find that the prominent firm will charge a lower price than its less prominent rivals making a firm prominent will typically lead to higher industry profit but lower consumer surplus and welfare the model is extended by introducing heterogeneous product qualities in which case the firm with the highest quality product has the greatest incentive to become prominent and making it prominent will boost industry profit consumer surplus and welfare

product differentiation search costs and competition in the mutual fund industry a case study of s p 500 index funds we investigate the role that non portfolio fund differentiation and information search frictions play in creating two salient features of the mutual fund industry the large number of funds and the sizeable dispersion in fund fees in a case study we find that despite the financial homogeneity of s p 500 index funds this sector exhibits the fund proliferation and fee dispersion observed in the broader industry we show how extra portfolio mechanisms explain these features these mechanisms also suggest an explanation for the puzzling late 1990s shift in sector assets to more expensive and often newly entered funds an influx of highinformation cost novice investors

modelling cognitively bounded rationality an evaluative taxonomy abstract since its origins in the 1950s the notion of bounded rationality has been incorporated into economic theory using an array of methodological approaches this paper presents a taxonomy by which these approaches can be categorized and understood evaluating each approach against a range of important criteria at a time when the foundations of economic theory are being re examined this paper should be viewed as a first step towards an assessment of the appropriate role that this more realistic view of cognition should take in different areas of economic theory and also of the desirable characteristics of models that incorporate it

too much information information provision and search costs a seller often needs to determine the amount of product information to provide to consumers we model costly consumer information search in the presence of limited information we derive the consumer s optimal stopping rule for the search process we find that in general there is an intermediate amount of information that maximizes the likelihood of purchase if too much information is provided some of it is not as useful for the purchase decision the average informativeness per search occasion is too low and consumers end up choosing not to purchase the product if too little information is provided consumers may end up not having sufficient information to decide to purchase the product the optimal amount of information increases with the consumer s ex ante valuation of the product because with greater ex ante valuation by the consumer the firm wants to offer sufficient information for the consumer to be less likely to run out of information to check one can also show that there is an intermedi

technology entrepreneurship and path dependence industrial clustering in silicon valley and route 128 silicon valley and route 128 have been the centers of innovation and commercialization for the electronics computer and data communications industries in the postwar period however since the 1960s silicon valley has grown more rapidly and from approximately 1985 through 1995 route 128 experienced retarded growth their success had diverged dramatically in the last decade the most common explanations for this divergence are differing cultures interfirm relations or and internal organizational style organization this paper builds upon path dependent and dominant design explanations of technical and industrial change arguing that the technological trajectories of the industries underlying the two regions were different and this led to their differential destinies to explain the dynamics of the two regions and analytical separation is made between the economy of the existing firms and a separate economy of institutions that evolved to nurture new firm formation copyright 1999 by oxford university press

constructing regional advantage platform policies based on related variety and differentiated knowledge bases asheim b t boschma r and cooke p constructing regional advantage platform policies based on related variety and differentiated knowledge bases regional studies this paper presents a regional innovation policy model based on the idea of constructing regional advantage this policy model brings together concepts like related variety knowledge bases and policy platforms related variety attaches importance to knowledge spillovers across complementary sectors the paper categorizes knowledge into analytical science based synthetic engineering based and symbolic arts based in nature with different requirements of virtual and real proximity mixes the implications of this are traced for evolving platform policies that facilitate economic development within and between regions in action lines appropriate to incorporate the basic principles behind related variety and differentiated knowledge bases asheim b t boschma r and cooke p

can prominence matter even in an almost frictionless market consumer search on the internet is rarely random sponsored links appear higher up a webpage and consumers often click them firms also bid aggressively for these prominent positions at the top of the page but why should prominence matter when visiting an additional website is almost costless i present a model in which consumers know their valuations for the products offered in the market but do not know which retailer sells which product i show that a prominent retailer earns significantly more profit than other firms even when the cost of searching websites and comparing products is essentially zero

spatial externalities relatedness and sector employment growth in great britain bishop p and gripaios p spatial externalities relatedness and sector employment growth in great britain regional studies this paper examines the impact of externalities on employment growth in sub regions of great britain by estimating ordinary least squares ols and maximum likelihood spatial models at the two digit level for 23 sectors issues arising from relatedness sector differences competition cross boundary spillovers and spatial autocorrelation are explicitly addressed results indicate that specialization has a generally negative impact on growth whilst the impact of diversity is heterogeneous across sectors and strong local competition has a typically positive impact the results question the merits of policies primarily aimed at promoting regional specialization and suggest that diversity local competition and sector heterogeneity are important policy issues bishop p et gripaios p les effets externes geographiques la connectivite et la croissance de l emploi sectoriel en grand

true monopolistic competition as a result of imperfect information the paper restates hart s 1985a 1985b definition of large group monopolistic competition distinguishes it from oligopolistic competition and raises the question of whether there are reasonable circumstances that give rise to true monopolistic competition as defined the purpose is to show that consumers imperfect information may create conditions that will turn an otherwise oligopolistic market into a truly monopolistically competitive one