technological activity and survival of firms abstract the paper presents new evidence on the effect of technological activity on the post entry performance of firms by comparing firm survival across technical and non technical products and over stages of differing technological activity it attempts to resolve two seemingly contradictory hypotheses that uncertainty inherent in high technological activity reduces the probability of survival and that technological activity increases the probability of entrant survival the empirical results in the context of the product life cycle framework show that entering firms enjoy a higher probability of survival in stages of high technological activity and in products that are more technical in nature however the hazard function the probability of failure conditional on age is higher for technical products reflecting the adverse effects of technical uncertainty and obsolescence of incumbent knowledge

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

the effect of crises on firm exit and the moderating effect of firm size abstract the liability of smallness assumption suggests that smaller firms face higher exit risks however does it apply during crises we show that during downturns size reduces firms exit risk by less the hazard rate increases more rapidly in size

land rental development via institutional innovation in rural jiangsu china previous studies have demonstrated that there are two important preconditions for encouraging land rental in agriculture out migration and the enhancement of security and transferability of land rights focusing on the latter we scrutinize the impacts of institutions aimed at facilitating land use dynamism particularly the rural shareholding cooperatives rscs which have been established recently at the local level in rural china in general we find that rscs can pave the way for the extension of property rights to farmland and promote more efficient land use patterns using survey data collected from 300 village committees in rural jiangsu province we estimate the effectiveness of rscs in encouraging land rental our analysis reveals that rscs can serve as intermediate agents for reducing transaction costs associated with exchange of land use rights and thereby not only encourage land rental consolidation activities but also enable the entry of non farm household entities into the farm business

the effect of land tenure governance on technical efficiency evidence from three provinces in eastern china this study aims to identify the mechanisms through which land tenure governance affects the technical efficiency of grain production in an integrated framework and to examine the impacts of the public governance village self governance and relational governance of land tenure on the technical efficiency of contracted land and rented in land farm level survey data collected from liaoning jiangxi and jiangsu provinces covering the years of 2014 and 2015 is used for the empirical analysis the findings indicate that i public governance associated with land certification significantly increases the technical efficiency of grain production ii village self governance and administrative land reallocations can serve as substitutes for the land rental market in optimizing the distribution of land resources and improving technical efficiency and iii compared to multi year transfer contracts both annual and open ended transfer contracts have negative impacts on technical efficiency

analysis of environmental efficiency variation in this article we develop and implement a methodology for analyzing the sources of variation in environmental efficiency across producers we formulate a two stage model in the first stage we use stochastic frontier analysis to estimate both technical and environmental efficiency in the second stage we again use stochastic frontier analysis to regress estimated environmental efficiency scores against a variety of technology physical environment and management variables in this stage we estimate the impact of each explanatory variable on environmental efficiency and we derive conditional estimates of environmental efficiency from the one sided error component we illustrate our methodology with an empirical application to a panel of dutch dairy farms we find evidence of relatively low levels of environmental efficiency and we find that environmental efficiency can be improved through a number of policy options including the provision of farmers with more insight into the nutrient balance of their farms

do overlapping property rights reduce agricultural investment evidence from uganda the need for land related investment to ensure sustainable land management and increase productivity of land use is widely recognized however there is little rigorous evidence on the effects of property rights for increasing agricultural productivity and contributing toward poverty reduction in africa whether and by how much overlapping property rights reduce investment incentives and the scope for policies to counter such disincentives are thus important policy issues using information on parcels under ownership and usufruct by the same household from a nationally representative survey in uganda the authors find significant disincentives associated with overlapping property rights on short and long term investments the paper combines this result with information on crop productivity to obtain a rough estimate of the magnitudes involved the authors make suggestions on ways to eliminate such inefficiencies

does land renting out increase farmers subjective well being evidence from rural china although the literature finds that renting out farmland can increase farmer s income whether lessors subjective well being swb increases or not has been under analysed we use data from the 201

inverse productivity land quality labor markets and measurement error abstract this paper examines the role that land quality and imperfect markets play in generating the inverse productivity relationship in the international crop research institute for the semi arid tropics icrisat data differences in land quality largely explain the inverse productivity ip relationship in the random effects profit regression but not in labor demand regressions controlling for labor and land market failures and differences in soil quality eliminates the ip relationship for male labor but not female labor in the random effects estimates the inverse relationship is much stronger in fixed effects than random effects estimates suggesting that the farm size variable may be subject to measurement error a view supported by the results of instrumental variables estimation

social networking websites who survives abstractthis article studies the relationship between the characteristics of social networking sites snss and their probability of survival the data sample includes 224 snss launched throughout the world from 1995 to 2015 and that can be described by focus strategy business financing methods and interactions with external companies such as partnerships mergers and acquisitions three factors are systematically associated with closure hazard rates first compared with snss that address a specialized audience generalist snss have a three times higher probability of closing second being the target of a merger or acquisition more than doubles the probability of closure third new entrants have higher probability to survive if compared with snss with experience in the industry

dumping and dynamic competition abstract when the current output level affects future production costs domestic and foreign profit maximizing firms may set prices below current costs to gain experience antidumping enforcement which poses a barrier to below cost sales by foreign rivals changes the payoff structure of competition and alters the equilibrium decisions of both foreign and domestic firms a comparison of the nash equilibria with and without antidumping rules shows that these rules change market outcomes even when they do not appear to be binding ex post this positive analysis of antidumping enforcement complements previous studies that have considered the motivation for dumping

comparing features of convenient estimators for binary choice models with endogenous regressors abstract we discuss the relative advantages and disadvantages of four types of convenient estimators of binary choice models when regressors may be endogenous or mismeasured or when errors are likely to be heteroscedastic for example such models arise when treatment is not randomly assigned and outcomes are binary the estimators we compare are the two stage least squares linear probability model maximum likelihood estimation control function estimators and special regressor methods we specifically focus on models and associated estimators that are easy to implement also for calculating choice probabilities and regressor marginal effects we propose the average index function aif which unlike the average structural function asf is always easy to estimate

household resources transaction costs and adjustment through land tenancy this paper examines the role of household endowments of imperfectly tradeable factors of production e g male female child labor and draft animals on land leasing an explicit attempt is made to account and test for the role of transaction costs on the incidence and extent of adjustment taking place through the land lease market the econometric model is implemented using pooled data from six villages in the semiarid region of india the results confirm the significant role of nontradeable family endowments and indicate the presence of frictions in the land tenancy market

do small plants grow faster evidence from the taiwan electronics industry abstract the relationships between plant size age labor productivity and growth rates are examined for a sample of taiwan electronics plants plant growth is negatively related to both size and age and positively related to labor productivity

endogeneity of risk perceptions in averting behavior models this paper examines the relationship between averting expenditures choices and perceived health risks models in the literature often employ risk perceptions as explanatory variables without addressing the potential endogeneity of the perceived risk we examine the implications of ignoring endogeneity in this context using an application to both drinking water choices and expenditures and perceived health risks our data are from an internet based cross canada survey that employs a novel interactive risk ladder to elicit mortality risk perceptions relating to water we employ two fundamentally different methods to assess the impact of risk perceptions on behavior an analysis of expenditures on alternate water sources and a model of proportional choice of water sources results suggest the presence of averting behavior with respect to perceived mortality risks and that the estimated effect of water risks is greater than 3 times higher when using approaches that correct for endogeneity compared to models that do not

has the byrd amendment affected us imports the continued dumping and subsidy offset act cdsoa also known as the byrd amendment allows the u s government to distribute revenues from antidumping duties to domestic firms alleging harm prior to the amendment these revenues were not distributed to firms in this article we formally test the hypothesis that the byrd amendment effectively provides double protection to u s firms to the extent that it further restricts u s imports as argued by the e u and eleven other u s trading partners using a rich panel of 362 u s manufacturing industries for the period 1998 to 2003 we find that whether or not the byrd amendment restricted u s imports depends crucially on the level of competitiveness in the import competing industry specifically we find that the byrd amendment served to restrict imports only in industries where competition is relatively weak while the amendment is associated with an increase in imports in more competitive industries

domino dumping i competitive exporters when exporting firms face the prospect of voluntary export restraints they have an incentive to export more than with no prospect of a voluntary export restraint since greater exports lead to larger license allocations in the event of a voluntary export restraint export country governments incentives differ leading either to export tax or subsidy depending on the circumstances the prospect of one departure from free trade thus leads to another a domino effect antidumping enforcement will ordinarily not eliminate and ironically may increase dumping copyright 1992 by american economic association

impacts of land certification on tenure security investment and land market participation evidence from ethiopia this brief summarizes the results of a gender impact evaluation study entitled impacts of land certification on tenure security investment and land market participation evidence from ethiopia conducted between 2006 and 2011 in ethiopia the study observed the impact of land registration on tenure security land related investment and rental market participation using 900 randomly selected households and 4000 plots cultivated by the households on the household and land plots level certification resulted in significant reduction of tenure insecurity and an increase in land related investment the propensity to invest in water conservation increased between 20 and 30 percent from panel estimates the increased investment appears to be sustained over the long term the propensity to rent land increases by 9 to 13 percent the titling had significant positive impacts on the rate at which female headed households rented their land funding for the study derived from the gender action plan global land tools network and norwegian environmentally and socially sustainable development essd trust fund

land reform as commenced business the evidence against stopping abstract in the new paradigm institutions are long term endogenous thus the aims of land reform must be compatible with replace or substitute for initial incentives and power structures many reforms e g compulsory collectives are not redefinition of land reform is therefore needed yet the case for private land redistribution with ceilings remains the inverse relationship rests firmly on lower cost labor transactions in small farms though large but competitive transport or processing firms which enjoy lower cost capital transactions may be needed crucial is the impact of the postreform structure on livelihoods especially for the growing rural majority near landless workers new style market based reforms have potential probably best combined with old style ceilings substantial compensation with urban taxpayers sharing costs alternative off farm prospects and progressive taxes on large landholdings or bequests

financial and legal constraints to growth does firm size matter using a unique firm level survey database covering 54 countries we investigate the effect of financial legal and corruption problems on firms growth rates whether these factors constrain growth depends on firm size it is consistently the smallest firms that are most constrained financial and institutional development weakens the constraining effects of financial legal and corruption obstacles and it is again the small firms that benefit the most there is only a weak relation between firms perception of the quality of the courts in their country and firm growth we also provide evidence that the corruption of bank officials constrains firm growth

do land markets improve land use efficiency evidence from jiangsu china inefficient use of scarce and fragmented land challenges the sustainability of agriculture land markets may improve land use efficiency in recent years china has employed various instruments to

political pressure deflection much economic policy is deliberately shifted away from direct political processes to administrative processes political pressure deflection pressure deflection poses a puzzle to standard political economy models which suggest that having policies to sell is valuable to politicians the puzzle is solved here by showing that incumbents will favor pressure deflection since it can deter viability of a challenger essentially like entry deterrence u s trade policy since 1934 provides a prime example especially antidumping law and its evolution

econometric estimation of technical and environmental efficiency an application to dutch dairy farms in this article we estimate the technical and environmental efficiency of a panel of dutch dairy farms nitrogen surplus arising from the application of excessive amounts of manure and chemical fertilizer is treated as an environmentally detrimental input a stochastic translog production frontier is specified to estimate the output oriented technical efficiency environmental efficiency is estimated as the input oriented technical efficiency of a single input the nitrogen surplus of each farm the mean output oriented technical efficiency is rather high 0 894 but the mean input oriented environmental efficiency is only 0 441 intensive dairy farms are both technically and environmentally more efficient than extensive farms

trade diversion from tomato suspension agreements trade barriers can cause output to be diverted to other countries and into other products we study the effect of a voluntary price restraint vpr on mexican tomatoes entering the united states the diversion caused by the vpr is statistically and economically significant representing over four fifths of the direct effects of the trade barrier when the vpr was binding mexico exported more tomatoes to canada the united states cut back on exports while canada increased their exports to the united states the vpr also diverted fresh tomatoes in mexico into paste production which was then exported to the united states des barrieres commerciales peuvent entrainer la diversion de l output vers d autres pays ou d autres productions on etudie la diversion causee par les accords de restriction volontaire des prix arvp des tomates mexicaines entrant sur le marche americain la diversion causee par les arvp a ete statistiquement et economiquement significative representant plus des quatre cinquiemes des effets directs de la barriere tarifaire quand les arvp ont ete contraignants le mexique a exporte plus de tomates au canada les etats unis ont reduit leurs exportations alors que le canada augmentait ses exportations vers les etats unis les arvp ont aussi entraine une diversion des tomates fraiches au mexique vers la production de puree de tomate un produit qui a alors ete exporte vers les etats unis

nontariff barriers and trade liberalization i introduction it is common to recognize that tariffs have gradually been replaced by nontariff barriers ntbs some authors go even further and argue there is a law of constant protection an expression used by bhagwati 1988 mainly to dismiss the idea baldwin 1984 600 for instance writes not only have these measures become more visible as tariffs have declined significantly through successive multilateral trade negotiations but they have been used more extensively by governments to attain the protectionist goals formerly achieved with tariffs the purpose of this article is to set up a model in which the effect of trade liberalization on the use of quotas and antidumping laws can be investigated directly we analyze two types of bilateral trade liberalization tariff reductions and quota elimination we show that our model is consistent with a progression from the use of tariffs only to the use of quotas following tariff liberalization to the use of antidumping laws when quotas have been jointly tarrified second it is also consistent with a narrowing of the range of industries in which each of these instruments is used third the extent of bilateral tariff liberalization and the ensuing degree of replacement of tariffs by ntbs depend on the combination of two industry specific characteristics the government s preferences for domestic firm profits and the importance of international transport cost in the industry overall our results suggest that treaties that remove or reduce one type of distortion may lead to the use of other policies tha t are even worse but despite the use of ntbs overall trade is more liberal to show these results we use a standard two country model with two way trade where the policy maker s objective function is quasi concave this last characteristic is important to explain some of the results as it leads to strategic complementarity in the tariff game and to the possibility of interior solutions in the quota game our results appear to track three separate sets of empirical facts well first evidence shows that there is a clear emergence of quantitative restrictions in the 1960s in manufacturing sectors and in developed economies followed by an explosion in the use of antidumping constraints since the 1980s 1 the emergence of these two ntbs can be linked to preceding multilateral trade rounds and in particular to the completion of the kennedy round today the general agreement on tariffs and trade gatt 1990 10 notes that despite a recent decline in the number of anti dumping investigations initiated in the united states and the european communities anti dumping remains after tariffs the most frequently invoked trade policies in these countries antidumping measures are also spreading to developing countries nogues 1993 quantitative restrictions are meanwhile on the decline as signatories of the uruguay round agreement are now required to tariffy existing quotas and constrain their future use gatt 1990 documents specific import quotas import licensing restrictions and items subject to import prohibition that have been eliminated in recent years second the gradual replacement of trade tools has also been accompanied by a reduction of the number of sectors affected by ntbs whereas very few products were traded without levy before the various gait rounds renner 1971 finds that 7 of the four digit product classes were affected by quantitative restrictions in the united states and in the european communities in 1970 the number of antidumping cases in the european communities initiated and or ending up with a positive decision represents a fraction of this number see gait 1993b mainly concentrated on a very small number of sectors see messerlin and reed 1995 of course it is not because a smaller number of sectors are affected by ntbs that overall protection necessarily decreases however given the high rates of growth in world trade it seems likely that despite this substitution the overall level of protection has decreased over time

post entry behaviour and the cycle evidence from germany abstract based on a rich database on establishments in western germany the paper aims at characterising the relationship between on the one hand growth and exit of entering cohorts and on the other hand aggregate business fluctuations a main finding is that exit is not responsive to the cycle which is at odds with views of recessions as times of cleansing where creative destruction processes occur the growth of survivors also displays little cyclical sensitivity but tends to become more responsive to aggregate business fluctuations as the cohort ages two possible explanations for this role of age on the cyclical sensitivity of surviving units are offered in the final section of the paper the first draws on the product specialisation of young and more established plants the second on the role of irreversible investment and industry selection

welfare costs of the u s antidumping and countervailing duty laws abstract the antidumping ad and countervailing duty cvd laws in the united states have become the most pervasive form of import relief sought by domestic producers this paper estimates the collective economic effect of the hundreds of active u s ad cvd orders using a computable general equilibrium model we estimate that the collective net economic welfare cost in 1993 of these orders to be 4 billion this welfare estimate is sensitive to various modeling assumptions which are explored in the paper with the implementation of the uruguay round agreements the ad cvd laws remain one of the costliest programs restraining u s trade

the effect of domestic antidumping law in the presence of foreign monopoly abstract we analyze the effects of antidumping law when utilized by competitive domestic petitioners against a foreign monopolist the monopolist reduces the cost of holding excess capacity in periods of slack foreign demand by dumping on the domestic market antidumping law reduces trade volume both directly under successful petitions and indirectly when no petition is filed by causing the monopolist to alter its capacity and the allocation of that capacity between markets finally we consider the effects of self enforcing agreements in which the domestic industry agrees not to file in exchange for a promise that the foreign monopolist limit exports

participation in rural land rental markets in sub saharan africa who benefits and by how much evidence from malawi and zambia we use nationally representative household level panel survey data in two neighboring countries in southern africa zambia and malawi to characterize the current status of rural land rental market participation by smallholder farmers and their subsequent welfare impacts rural rental market participation is much higher in densely populated malawi than in lower density zambia reflecting the role of land scarcity in driving rental market development consistent with previous literature we find evidence that rental markets contribute to efficiency gains within the smallholder sector by facilitating the transfer of land from less able to more able producers on average in both countries furthermore we find that rental markets serve to re allocate land from relatively land rich to land poor households we examine the impacts of participation on a number of welfare outcomes and find evidence for generally positive returns to renting in land in both countries on average however our analysis also indicates that the returns to renting in land vary strongly with scale of production tenants who produce more have larger returns to renting in and many of the smaller producers who rent in do so at an economic loss the impacts of renting out i e participating in markets as landlords are decidedly more mixed with overall negative returns to landlords in malawi and negligible returns to landlords in zambia the findings in this article highlight the need for researchers and policymakers in sub saharan africa to stay attuned to how land rental market participation and its impacts evolve in the near future

land tenure security and investment incentives puzzling evidence from burkina faso abstract the commonsense logic associating higher land security and higher incentives to invest has been recently called into question in the case of african agriculture to be meaningful empirical tests have to be carefully designed so as to take account of the possible endogeneity of the land rights variable this is done in this paper by applying suitable econometric methods to the original data collected in burkina faso the results obtained cast doubt on the existence of a systematic influence of land tenure security on investment by reviewing the justifications for scepticism in the recent literature we are able to conclude that the traditional village order where it exists provides the basic land rights required to stimulate small scale investment

endogenous protection foreign direct investment and protection building trade abstract we introduce the possibility of foreign direct investment fdi in a strategic oligopolistic setting with endogenous protection and find that a number of unique subgame perfect equilibria may arise including a new result we call protection building trade this phenomenon occurs in our model when foreign firms locating production in the home country try to increase protectionist pressures in the home country through increased exports to provide larger barriers against other foreign competitors in future periods we discuss how the foreign firm behavior surrounding significant u s protectionist actions including the vers on japanese automobiles may be consistent with protection building trade behavior

domino dumping ii anti dumping abstract domino dumping anderson american economic review 1992 82 65 83 arises when exporting firms dump to obtain more export licenses in the future when there is a positive probability of a future ver anti dumping policy may then be in the public interest for the importing country via lowering the probability of a ver increased enforcement may perversely lead to a rise in dumping also it may increase the probability of a ver and may reduce the probability of free trade it is possible for the public interest to require some enforcement however it is normally in the public interest to permit some dumping

land tenure differences and investment in land improvement measures theoretical and empirical analyses this article develops a theoretical framework to examine the relationship between land tenure arrangements and households investment in soil improving and conservation measures it then analyzes this relationship with a multivariate probit model based on detailed plot level data from villages in the brong ahafo region of ghana a major hypothesis tested is that investment in productivity enhancing and conservation techniques are influenced by land tenure arrangements the theoretical analysis and empirical results generally reveal that land tenure differences significantly influence farmers decisions to invest in land improving and conservation measures the findings also show that tenure security does affect farm productivity

does it pay to participate in decision making survey evidence on land co management in jiangsu province china member participation in decision making is a critical part of resource co management however little is known about the welfare consequences of participation this paper analyzes the impact of cooperative member participation in decision making on their incomes using data from 364 members of china s land cooperative program we distinguish two levels of participation in decision making voting and obtaining financial information and use a bivariate probit model and propensity score matching to estimate their impact the results indicate that household head s age gender and education and family size wealth and political affiliation determine participation in decision making participation in either voting or obtaining financial information has a positive impact on cooperative members land income there is also a strong joint effect of voting and obtaining information with an increase in land income of 16 we conclude that broad participation can ensure more equitable access to land income for members

migration remittances and agricultural productivity in china in our paper we have used the new economics of labor migration framework to trace the complex linkages that exist among migration remittances and agricultural productivity in china constraints in the operation of on farm labor and capital or insurance markets or institutions provide households with a motivation to migrate and distort on farm operations when labor leaves in our household sample the net impact of migration and remittances on maize production is negative excerpt

the potential of land rental markets in the process of economic development evidence from china abstract we develop a model of land leasing with agents characterized by unobserved heterogeneity in ability and presence of an off farm labor market in this case decentralized land rental may contribute to equity and efficiency goals and may have several advantages over administrative reallocation the extent to which this is true empirically is explored using data from three of china s poorest provinces land rental markets and administrative reallocation reallocate land to those with lower endowments but the former are more effective in doing so and have a bigger productivity enhancing effect information on hypothetical market participation suggests that reducing transaction costs in land rental markets could help to realize significant additional productivity gains

networks and local environmental characteristics in the survival of new firms this study seeks firstly to clarify which networks at start up situation and early in life influence the survival of new firms secondly the study examines regional differences in the success of new firms the subjects were firms which had closed down during their fourth to sixth year of operations and they were compared with firms continuing in business the results indicate firstly that it is networks internal to firm that create competitive advantage innovation and efficiency secondly management based on working in groups was emphasized in the firms that continued in business in a typical family enterprise ownership management and family are united in a single entity in other types of firms networks are seen as participating in the strategic management of the firm thirdly close downs were often caused by uncontrolled risks a firm which fails after a successful start up often tends to grow rapidly in the beginning leaning on its product idea but this rate of growth is too high from the viewpoint of the financing and the management of the firm in firms which closed the growth objectives were too ambitions compared with the resources of the entrepreneur

agricultural technology productivity and poverty in madagascar summary this paper uses a unique spatially explicit dataset to study the link between agricultural performance and rural poverty in madagascar we show that controlling for geographical and physical characteristics communes that have higher rates of adoption of improved agricultural technologies and consequently higher crop yields enjoy lower food prices higher real wages for unskilled workers and better welfare indicators the empirical evidence strongly favors support for improved agricultural production as an important part of any strategy to reduce the high poverty and food insecurity rates currently prevalent in rural madagascar

rural market imperfections and the farm size productivity relationship evidence from pakistan the subject of this article is the relationships between farm size and productivity and between farm size and profitability in the developing countries the recent controversies over the inverse size output relationship are reviewed and a framework is provided that explains the inverse relationship based on plausible assumptions about imperfections in the markets for labor land credit and risk from this framework a set of testable hypotheses are derived the hypotheses are tested on recent farm level panel data from pakistan a strong inverse relationship between farm size and yield is present in the sample even when household fixed effects are used to account for unobserved heterogeneity moreover the suggested market imperfections framework is consistent with the data

why can t countervailing duties deter export subsidization abstract this paper shows that in a duopoly model of international market competition threatened imposition of countervailing duties by a domestic country generally deters a foreign country from subsidizing its exports to the former to explain the coexistence of export subsidization and the gatt conform countervailing duty measures factors such as delay in retaliation the gatt constraint on the amount of countervailing duties and voluntary export restraints must be considered we find that these factors lessen the efficacy of countervailing duty retaliation and therefore fail to deter export subsidization

the relation between farm size and farm productivity the role of family labor supervision and credit constraints abstract the paper shows that if the performance of hired farmhands is affected by supervision from family members and if the availability of credit is dependent on the amount of land owned then a systematic positive or negative relationship between per acre yields and farm size will prevail a model with no supervision effects on labor productivity would predict that yields are unaffected by farm size the paper also investigates the relation between land utilization and owned holding size when land rental possibilities are limited results are shown to be compatible with various observed patterns in ldcs