natural resource prices will they ever turn up abstract natural resource theory predicts that natural resource rents should increase over time however technical progress in resource extraction environmental constraints or great natural abundance could result in stagnant or declining product prices thus there is no theoretical reason to believe that product prices will rise in the near future the prediction of product prices by time series methods is shown to depend critically upon whether the series are modeled as difference or trend stationary dickey fuller and lagrange multiplier tests are used to show that the series are difference stationary long and short sample series are tested trend stationary modeling strongly predicts rising resource prices the result from difference stationary modeling is that there is only a weak supposition that natural resource prices will rise

coworker influence on annuitization decisions evidence from defined benefit plans abstract we investigate the role of coworker influence on an individual s annuitization decision using rich data on payout options and decisions in defined benefit plans we find that past payout choices of coworkers significantly affect an employee s decision to annuitize at retirement and that the coworkers payout choices have a larger economic effect on annuitization than recent stock market returns we also find that coworker effects are greater for employees who have a similar level of benefit amounts those who share geographic proximity same zip code and those who retire at a norm modal retirement age of their workplace robustness tests show that estimated coworker effects are unlikely to be driven by unobserved common environments or similar preferences

social learning and health insurance enrollment evidence from china s new cooperative medical scheme abstract this paper examines the role of social learning in household enrollment decisions for the new cooperative medical scheme ncms in rural china by estimating a static game with incomplete information using a rich dataset from the china health and nutrition survey we find that a 10 percentage point increase in the enrollment rate in a village increases one s take up probability by 5 percentage points using multiple model specifications we show that the estimated social effects are not driven by simultaneity or common unobserved factors but are consistent with the hypothesis of social learning we also find that the importance of social effects decreases significantly with households familiarity with the ncms as well as with the development of alternative information channels which further ascertains that the primary mechanism for the social effects is social learning the evidence suggests that healthier wealthier relatively well educated older han male household heads tend to be opinion leaders

the efficiency of sponsor and participant portfolio choices in 401 k plans abstract to evaluate the extent of inefficient behavior in 401 k pensions now the dominant form of retirement saving in america we attribute inefficiencies separately to the employer s menu design versus participant portfolio elections results from our analysis of over 1000 plans and a million participants demonstrate that most sponsors offer efficient investment menus but participants undo this by constructing inefficient portfolios thus reducing their potential retirement wealth by one fifth because participants are the main source of inefficient pension investment choices strategies targeting their behavior may be useful including improved default investment strategies or educational programs we also show that the number of options offered is less important than the range of funds provided when designing 401 k menus

valuing mineral reserves when capacity constrains production abstract we add a capacity constraint and heterogeneous reserves to the hotelling valuation principle this produces a more general version of the principle that is more consistent with empirical valuations while retaining the underlying relationship between net price and reserve value

neighborhood effects and social behavior the case of irrigated and rainfed farmers in bohol the philippines artifactual field experiments spatial econometrics and household surveys are combined in a single study to investigate the neighborhood effects of social behaviors the dictator and public goods games are conducted among rice farmers in irrigated and non irrigated areas in the philippines we find the neighborhood effects but the magnitude and statistical significance of endogenous social effects vary with the irrigation availability type of social behavior and type of neighborhood altruistic and cooperative behaviors are significantly influenced by the behaviors of neighbors only in the irrigated area where social ties are strengthened through collective irrigation management through this effect irrigated farmers social behaviors become similar to those of one another neighborhood effects for cooperative behavior are stronger among farm plot neighbors than among residential neighbors which may reflect their interactions in irrigation management although non dynamic these findings are consistent with the theory of social norm evolution through common pool resource management

modelling regional patterns of innovation diffusion in the uk metalworking industries alderman n and davies s 1990 modelling regional patterns of innovation diffusion in the uk metalworking industries reg studies 24 513 528 in this paper davies economic model of innovation diffusion is tested at the regional level using survey data on the adoption of a number of key manufacturing technologies based on microelectronics or new materials within nine industries engaged primarily in metalworking activities the results demonstrate that there are regional variations in the rates of diffusion along one or other of the two types of trajectory derived from the model and that these have been slower in some peripheral regions than elsewhere these variations may be partly but by no means entirely accounted for by regional differences in industrial structure and establishment size distributions it is suggested however that as diffusion approaches saturation level regional convergence will be observed alderman n et davies s 1990 la modelisation de la distribution regionale de la diff

price expectations ore quality selection and the supply of a nonrenewable resource abstract economic models of depletion imply that the present value price of a resource and the quality of extracted ore should be directly related the empirical evidence is that in the short run the average quality of extracted ore and in some cases metal output decline in response to a price increase this paper examines a model of extraction with heterogeneous ore quality within a deposit and revised price expectations in which this seemingly paradoxical supply response is rationalized as the outcome of ore quality selection which maximizes the present value of the mine

exploration and scarcity noting that a suggested measure of natural resource scarcity resource rent is unobservable we show that rent is linked to observable marginal exploration cost a two period model of extraction and exploration reveals that rent is equal to this cost when discovery is certain under risky exploration cost data can be used to bound rent the model also indicates how exploration uncertainty affects the competitive firm s extraction and exploration decisions finally the behavior of u s oil and gas exploration costs suggests that these costs were rising in the postwar era which has different implications for scarcity than indicated by other measures of scarcity

planning and financial literacy how do women fare many older us households have done little or no planning for retirement and there is a substantial population that seems to undersave for retirement of particular concern is the relative position of older women who are more vulnerable to old age poverty due to their longer longevity this paper uses data from a special module we devised on planning and financial literacy in the 2004 health and retirement study it shows that women display much lower levels of financial literacy than the older population as a whole in addition women who are less financially literate are also less likely to plan for retirement and be successful planners these findings have important implications for policy and for programs aimed at fostering financial security at older ages

social interaction and stock market participation we propose that stock market participation is influenced by social interaction in our model any given social investor finds the market more attractive when more of his peers participate we test this theory using data from the health and retirement study and find that social households those who interact with their neighbors or attend church are substantially more likely to invest in the market than non social households controlling for wealth race education and risk tolerance moreover consistent with a peer effects story the impact of sociability is stronger in states where stock market participation rates are higher

on the nonexistence of market equilibria in exhaustible resource markets with decreasing costs this paper examines the existence of competitive equilibria in markets for exhaustible resources where there are initial economies of scale in either the extraction of the resource or the utilization of the resource as an input in production in such instances which are fairly common we find that the classic hotelling rule for competitive extraction does not apply since competitive price equilibria generally do not exist this is in marked contrast to static markets where the usual textbook example of firms with u shaped average cost curves is not inconsistent with the existence of competitive equilibria furthermore oligopolistic market equilibria in which resource firms act as nash producers may also fail to exist when there are returns to scale in production

the effects of financial education in the workplace evidence from a survey of households abstract we use a novel household survey to investigate the effects of employer based financial education on personal saving we explore cross sectional relations between the availability of employer based financial education and various measures of asset accumulation and we interpret these patterns in light of various potentially confounding factors our findings favor the hypothesis that employer based financial education stimulates saving both in general and for retirement

social interaction at work abstract stock market investment decisions of individuals are positively correlated with those of coworkers sorting of unobservably similar individuals to the same workplaces is unlikely to explain this pattern as evidenced by the investment behavior of individuals who move between plants purchases made under stronger coworker purchase activity are not associated with higher returns moreover social interaction appears to drive the purchase of within industry stocks overall we find a strong influence of coworkers on investment choices but not an influence that improves the quality of investment decisions

portfolio choice and trading in a large 401 k plan we study nearly 7 000 retirement accounts during the april 1994 august 1998 period several interesting patterns emerge most asset allocations are extreme either 100 percent or zero percent in equities and there is inertia in asset allocations equity allocations are higher for males married investors and for investors with higher earnings and more seniority on the job equity allocations are lower for older investors there is very limited portfolio reshuffling in sharp contrast to discount brokerage accounts daily changes in equity allocations correlate only weakly with same day equity returns and do not correlate with future equity returns

reserve characteristics and mining costs an empirical study of the phosphate industry this paper deals with an estimation of phosphate mining cost function here it is argued that other characteristics of reserves besides their size could be quite important in the cost function the result of a cross sectional analysis of phosphate mining in the world shows that reserve size and average total cost have a positive and modest statistically significant relationship in one of the two models among many qualitative characteristics and location factors tested in this paper overburden grade ore product ratio water availability and the price of capital are significant with expected signs finally the results confirm the existence of economies of scale in phosphate mining which seem to be more related to mining technology than to reserve size

resource characteristics extraction costs and optimal exploitation of mineral resources this paper modifies the traditional theories ofnon renewable resource exploitation where reserve sizeis assumed to be the major determinant of extractioncosts in a competitive model of resourceexploitation characteristics of aggregate reservesare considered as a determinant of extraction cost then dynamic solutions for the price and exploratoryefforts are developed various price paths arefeasible under different assumptions with regard tothe changes in the reserve characteristics over time past empirical research shows that there is noconsistent price path for all materials in fact itis the quality of newly discovered reserves as well astheir size that has affected material prices todemonstrate the complexity of a firm s decision torecover mineral from new deposits potentials forsubstantial high quality marine mineral resources areevaluated as a substitute for land based resources however several factors including the decreasingtrend in marine mining r d expenditures and thepotential impact of large scale marine mining on priceof minerals indicate that mining of mostnon hydrocarbon marine minerals will not take place inthe near future

grade selection under uncertainty least cost last and other anomalies abstract grade selection rules for heterogeneous resource deposits with increasing marginal extraction costs are derived it is shown that contrary to the conventional wisdom it can be optimal to extract the least cost deposits last there are a number of rules that are compatible with dynamic profit maximization under certainty nevertheless none explains empirical regularities in actual extraction patterns when uncertainty about future price is introduced however the theoretical model conforms closely not only to observed grade selection patterns but also to observed mineral industry price paths

social interactions in asset allocation decisions evidence from 401 k pension plan investors abstract this paper investigates social interaction effects on individual asset allocation decisions using a rich dataset of 159 329 individuals enrolled in 401 k plans we find that individuals are likely to increase decrease their risk shares when their coworkers have higher lower risk exposures over the last quarter the social interaction effects are especially strong among individuals with extreme asset allocations and low equity investment performance we also divide the workplaces into subgroups to examine how social interaction effects vary among coworkers with different backgrounds results from additional tests indicate that estimated social interaction effects are not primarily driven by common preferences common environments or reverse causality

effectiveness of employer provided financial information hiring to retiring in order to maximize lifetime utility workers must make choices throughout their careers to plan and save for retirement with the aging of the baby boomers and increasing life expectancies it is more important than ever for individuals to ensure they have adequate savings and resources for retirement to make optimal choices individuals need sufficient knowledge of how both national and employer provided retirement plans work and what benefits they should expect further they must have adequate financial literacy to navigate complex financial instruments and to understand the importance of various plan characteristics traditional models of life cycle earnings and consumption are based on the assumption that workers are aware of investment options understand the benefits they will receive from various retirement plans and have the ability to assess the impact of their saving decisions

sectoral supply of minerals of varying quality in this sectoral model of mineral production investment in capacity and variation in orebody grade and volume help explain some stylized facts more than one grade of ore may be exploited simultaneously mine exhaustion but not necessarily entry occurs in declining order of grade the price may rise or fall but is likely to fall initially young industry and must eventually rise at less than the interest rate unless demand expands rapidly these trends exhibit fluctuations due to entry and exhaustion of deposits resource price cyclicality is reinforced because mines keep producing at capacity when the price is falling

economics and identity this paper considers how identity a person s sense of self affects economic outcomes we incorporate the psychology and sociology of identity into an economic model of behavior in the utility function we propose identity is associated with different social categories and how people in these categories should behave we then construct a simple game theoretic model showing how identity can affect individual interactions the paper adapts these models to gender discrimination in the workplace the economics of poverty and social exclusion and the household division of labor in each case the inclusion of identity substantively changes conclusions of previous economic analysis

the role of information and social interactions in retirement plan decisions evidence from a randomized experiment this paper analyzes a randomized experiment to shed light on the role of information and social interactions in employees decisions to enroll in a tax deferred account tda retirement plan within a large university the experiment encouraged a random sample of employees in a subset of departments to attend a benee ts information fair organized by the university by promising a monetary reward for attendance the experiment multiplied by more than e ve the attendance rate of these treated individuals relative to controls and tripled that of untreated individuals within departments where some individuals were treated tda enrollment e ve and eleven months after the fair was signie cantly higher in departments where some individuals were treated than in departments where nobody was treated however the effect on tda enrollment is almost as large for individuals in treated departments who did not receive the encouragement as for those who did we provide three interpretations differential treatment effects social network effects and motivational reward effects to account for these results

participation and investment decisions in a retirement plan the influence of colleagues choices abstract this paper investigates whether peer effects play an important role in retirement savings decisions we use individual data from employees of a large university to study whether individual decisions to enroll in a tax deferred account plan sponsored by the university and the choice of the mutual fund vendor for people who choose to enroll are affected by the decisions of other employees in the same department to overcome the identification problems we divide the departments into sub groups along gender status age and tenure lines and we instrument the average participation of each peer group by the salary or tenure structure in this group our results suggest that peer effects may be an important determinant of savings decisions

identification of endogenous social effects the reflection problem this paper examines the reflection problem that arises when a researcher observing the distribution of behaviour in a population tries to infer whether the average behaviour in some group influences the behaviour of the individuals that comprise the group it is found that inference is not possible unless the researcher has prior information specifying the compisition of reference groups if this information is available the prospects for inference depend critically on the population relationship between the variables defining reference groups and those directly affecting outcomes inference is difficult to implossible if these variables are functionally dependent or are statistically independent the prospects are better if the variables defining reference groups and those directly affecting outcomes are moderately related in the population

an epidemic model of investor behavior i test whether social influence affects individual investors trading and stock returns in each of the 20 most active stocks in finland over 9 years the number of owners in a municipality multiplied by the number of investors who do not own a stock a measure of the rate of transmission of diseases and rumors through social contact predicts individual investor trading i control for known determinants of trade including daily news and show that competing explanations for the relation are unlikely socially motivated trades predict stock returns and the effects are not reversed suggesting that individuals share useful information individuals susceptibility to social influence has declined during the period but the opportunities for social influence have increased

resource taxation with heterogeneous quality and endogenous reserves abstract this paper analyzes the impact of mining taxation on the intertemporal extraction profile for a heterogeneous ore body the extraction profile specifies both quantities and qualities extracted in each period total extraction is thus endogenously determined the taxes explicitly considered are severance taxes ad valorem or per unit on metal or on ore property taxes and profits taxes with depletion allowance the intertemporal framework integrates economic and geological factors generating new results on extraction distortions and providing qualification or reconciliation of previous diverse results in this area