wages and work conditions as determinants for physicians work decisions it is not uncommon that publicly employed physicians also have income from work outside the hospital sometimes termed moonlighting there is little empirical evidence of such activity in this article we investigate which factors that may influence physicians choice of work between the public hospital sector and elsewhere an exceptionally high wage increase in 1996 for one group of hospital physicians physician assistants serves as a natural experiment and we analyse whether wages in general and this reform in particular have affected physicians external earnings for physician assistants we find that higher wages at public hospitals affect negatively both the decisions to earn income externally and level of income once active for chief physicians on the other hand there was no such response to the wage increase several hospital specific factors representing job specific work characteristics also matter for physicians decisions to earn income externally

explaining patterns of candidate competition in congressional elections the low probability of defeating incumbent members of congress deters potentially strong rivals from challenging them yet almost all incumbents are challenged usually by opponents who lack previous experience in office and run underfinanced ineffectual campaigns but if strong challengers are deterred from challenging incumbents why are not weak challengers who have even less chance of unseating an incumbent the model developed in this paper indicates that there is a simple reason why weak candidates choose to run against incumbents they do so in order to maximize their probability of getting elected to congress together with the findings of previous researchers the results of our analyses of congressional primary data from 1980 through 1984 provide strong support for the major hypotheses derived from our model

optimization based approach for price multiplicity in network constrained electricity markets this paper addresses the problem of price multiplicity in network constrained pool based electricity markets under marginal pricing this problem consists in the existence of multiple vectors of locational marginal prices for the same optimal market clearing dispatch solution as a consequence delicate conflicts of interest may arise among market participants price multiplicity may take place even in auction designs based on convex formulations for the market clearing procedure an effective duality based solution approach is proposed in this paper to handle the issue of price multiplicity once the optimal market clearing dispatch is known we propose the subsequent solution of a simple pricing problem in order to determine the vector of locational marginal prices unlike previously reported methodologies the proposed approach presents two salient features 1 it is based on sound mathematical programming and 2 it is computationally inexpensive since it relies on the solution of a linear program numerical results are provided to illustrate the performance of the proposed tool

on the solution of revenue and network constrained day ahead market clearing under marginal pricing part ii case studies this paper presents the numerical analysis of the bilevel programming approach for revenue and network constrained market clearing developed in its companion paper the impact of minimum revenue conditions and minimum declared profits on generation and consumption levels as well as on locational marginal prices for energy is examined in detail through three case studies first the results from an illustrative example including minimum revenue conditions are comprehensively analyzed the second case study is based on the ieee reliability test system and considers minimum declared profits in the third case study a modified version of the ieee 118 bus system is tested while accounting for minimum revenue conditions in addition the computational behavior of the proposed approach is illustrated with several case studies including the ieee 300 bus system numerical results show the effectiveness of the proposed approach to handle revenue constraints as well as its superiority over the heuristic currently implemented in the iberian electricity market moreover simulations reveal that unlike previous works in the literature generation revenue constraints can be precisely incorporated in day ahead market clearing while explicitly considering the standard economic dispatch based marginal pricing scheme and without requiring price uplifts

legislative professionalism and incumbent reelection the development of institutional boundaries it is well established that legislators from highly professionalized bodies are more likely to win reelection than members of less professionalized legislatures we find that the effect of professionalization on incumbent electoral success is far more pervasive as the level of professionalism of a legislature increases the effects of external political and economic forces such as coattails from higher level elections and national economic conditions on a legislator s chances for reelection diminish in strength this implies that legislative professionalization promotes institutionalization by establishing boundaries that insulate members from external shocks we reach these conclusions by specifying and testing a district level model of state legislative election outcomes using as dependent variable the probability that an incumbent will win reelection the model is estimated with probit using data for more than 42 000 state legislators from 1970 to 1989 w hat determines whether a legislator seeking reelection will win we address this question by paying particular attention to the role of professionalization of legislatures in influencing the electoral success of members we know that american legislators are highly likely to win reelection garand 1991 jacobson 1987 king 1991 we also know that those from highly professionalized institutions have even better odds than those from less professionalized bodies as the former have greater resources for travel to their districts holbrook and tidmarch 1991 for casework cox and morgenstern 1993 1995 king 1991 and for devoting time and energy to campaign activities carey niemi and powell 2000 we maintain however that professionalism does more than boost the electoral prospects of incumbents it changes members relationships with the legislature s political and economic environment in particular professionalization promotes legislative institutionalization by

the effects of regulation on research and development theory and evidence while other aspects of the effects of regulation on resource allocation have received considerable attention the impact of regulation on the innovative p ropensities of regulated firms has generated only limited and somewha t tenuous evidence accordingly this article investigates the effect s of regulation and firm structure on research and development r d expenditures a simple model of the behavior of a firm under a rate o f return regulation suggests that both the stringency of the allowed rate of return constraint and the inclusion or exclusion of r d in a firm s rate base will be key determinants of firm level r d expenditu res the empirical results strongly support the theoretical model copyright 1988 by the university of chicago

sector choice multiple job holding and wage differentials evidence from poland this article uses data from poland to investigate the role played by wage differentials between the public and private sectors in influencing sector choice and the decision to moonlight standardising for worker characteristics and allowing for sector selection effects we find i a substantial private sector wage premium ii wage differentials are a significant determinant of sector choice and iii the desire to moonlight is particularly strong among those who face the greatest wage gap that is university educated employees

the effect of taxation on labour supply the case of moonlighting the authors provide a simple test of supply side economics by estimating the responsiveness of moonlighting labour supply to changes in the marginal tax rate and the wage rate while standard theory teachers that changes in taxes and wage should have opposite and equal effects on labour supply taxes affect the entire asset position of the household in the short run an adjustment of hours in the second job may be the only option available to an individual in responding to a tax change thus analyses based on after tax wages may understate supply side effects to estimate these effects a tobit procedure is employed the empirical results suggest a backward bending supply curve over thet range of moonlighting hours data consist of a subsample of male blue collar workers from the 1978 cross section of the panel study of income dynamics

the economics of moonlighting a double self selection model the model proposed here for obtaining the labor supply functions of moonlighters uses a double self selection system to explore the husband s decision to moonlight together with his wife s decision to work subsequently the labor functions are classified under two regimes depending on whether the wife works the model is estimated based on a cross section of 4 448 married couples from the survey of income and program participation wave 2 i find that the household production time of husbands and wives are substitutes and that specific human capital deters moonlighting copyright 1990 by mit press

existence and determination of competitive equilibrium in unit commitment power pool auctions price setting and scheduling alternatives the existence determination and effects of competitive market equilibrium for unit commitment power pool auctions are investigated in this paper when an equilibrium does not exist under specific situations conflictive multiple optimal primal solutions may exist when an equilibrium exists multiple primal solutions do not represent conflicts of interest the existence or nonexistence of competitive equilibrium can be determined if the dual problem is solved to optimality if equilibrium does not exist there is excess supply at the optimal dual solution which can be used to define priority orders and price setting alternatives to determine a final schedule and avoid the conflicts of interest and revenue deficiency under disequilibrium the optimal dual variables are not market clearing prices a nonuniform pricing rule that avoids the flaws and complications of other pricing rules such as maximum average cost and price minimization auctions is proposed in the paper the proposed scheduling and price setting alternatives show that unit commitment models can be used in a market environment

the supply of off farm labor a random coefficients approach a joint model of off farm labor decisions for farm operator and spouse is presented attention is given to operator and spouse participation decisions as well as associated problems of multiple sample selectivity biases two stage fixed and random coefficient methods corrected for possible selectivity biases are used to estimate supply function parameters results indicate that supply function parameters are random variation in important supply parameters is investigated results also illustrate the importance of spouse decisions on off farm labor supply function structure

win lose or withdraw a categorical analysis of career patterns in the house of representatives 1948 1978 the literature on incumbency advantage has focused on margin as an indicator for electoral security but while electoral margin is a goodex ante measure it is a poorex post measure of security further existing work has not integrated the choice of retirement with changes in the level of security to improve the specification and definition of marginality a multinomial logit model is proposed where the dependent variable is categorical account is therefore taken of all the ways a representative s term in office can end including reelection defeat retirement or pursuit of other office the sample includes all u s representatives elected for the first time between 1948 and 1978 the results indicate that 1 margin in the previous election is a significantex ante proxy for the probability of electoral defeat and 2 while the electoral safety of all incumbents in the house has been increased the increases are greater for members elected for the first time in the period since 1965

coordination in markets with nonconvexities as a mathematical program with equilibrium constraints part i a solution procedure this paper is concerned with developing an algorithm for solving the coordination problem that arises in a new equilibrium model which for the purpose of this presentation applies to a static no time coupling costs or constraints electricity pool market with price inelastic demand and no network the new equilibrium model has the following main properties i every scheduled generator satisfies its minimum surplus or bid profit condition ii the energy price is a system marginal cost lagrange multiplier associated with the power balance constraint in the related economic dispatch problem where all of the discrete variables are fixed to their optimal values iii the power balance and all the generators technical constraints are satisfied to solve the coordination problem which is a subproblem of the new equilibrium model it is mathematically convenient to cast the former as a three level nested optimization problem we substitute the ensuing lower level subproblems with an equivalent set of explicit algebraic equalities and inequalities hence we obtain a one level problem which is a discrete continuous mathematical program with complementarity or equilibrium constraints mpec finally we transform the one level mathematical program into mixed integer linear form by substitution of the complementarity terms and the remaining nonlinear terms

multiple job holding among male workers in greece livanos i and zangelidis a multiple job holding among male workers in greece regional studies this paper studies the incidence of multiple job holding in greece and contributes to the literature by examining its determinants its variance across different regions and the effect of the business cycle on its occurrence the empirical analysis highlights the importance of both pecuniary and non pecuniary motives behind multiple job holding and reveals significant variations in its incidence across regions with areas that have a large primary sector having higher multiple job holding rates finally multiple job holding is found to be pro cyclical with the probability of holding a second job estimated to increase during economic expansion livanos i et zangelidis a les emplois multiples masculins en grece regional studies l article cherche a etudier la frequence des emplois multiples en grece et contribue a la documentation en examinant ses determinants sa variance a travers les diverses regions

on the solution of revenue and network constrained day ahead market clearing under marginal pricing part i an exact bilevel programming approach the first of this two paper series addresses a practical day ahead auction model where generation revenue constraints are explicitly incorporated in the problem formulation as routinely done in several national electricity markets across europe the revenue constrained market clearing procedure includes the effect of the transmission network inter temporal constraints associated with generation scheduling demand side bidding and marginal pricing this auction design is an instance of price based market clearing which features two major complicating factors first locational marginal prices become decision variables of the optimization process in addition producer revenues are formulated as bilinear and highly nonconvex products of power outputs and market clearing prices the resulting problem is formulated as a mixed integer nonlinear bilevel program with bilinear terms for which available solution techniques rely on heuristics approximations or modeling simplifications this paper presents a novel and exact methodology whereby the original problem is recast as an equivalent single level mixed integer linear program as a consequence finite convergence to optimality is guaranteed and the use of standard commercial software is allowed the proposed transformation is based on duality theory of linear programming karush kuhn tucker optimality conditions and integer algebra results in the second part of this two paper series numerical results from several case studies illustrate the effective performance of the proposed solution approach

job amenity and the incidence of double work abstract the hypothesis that workers in jobs associated with an amenity are more prone to moonlighting is derived and tested if earnings fall for such jobs it is rational to have two jobs while for jobs with no amenity a fall in earnings causes a rational worker to leave the sector altogether an amenity can be expected for instance for workers in primary sectors and evidence that farmers at an increasing rate have double occupations are provided the comparative statics on the models shows among other things that wage increases outside the amenity sector may have different effects than wage decreases inside the sector the models are tested on data on farmers and to some extent the regressions support the theoretical models

divided government in the american states a byproduct of legislative professionalism s since world war ii divided government has become increasingly common in the american states a significant component of the increase is the deterioration of republican fortunes in state legislatures after the 1990 and 1992 elections for example only five state legislatures were controlled by the republicans i shall examine the hypothesis that the professionalization of state legislatures makes legislative service more attractive to democratic candidates and less attractive to republican candidates because full time legislative service is incompatible with another career and democrats on average have less lucrative career opportunities than republicans statistical analysis of post world war ii legislative elections outside the south is consistent with the argument other things being equal every ten thousand dollar increase in real biennial legislative compensation is associated with approximately a 1 increase in democratic legislators

liquidity constraints as a cause of moonlighting an investigation of whether some workers respond to liquidity constraints by moonlighting is carried out using a unique large data set it is found that workers are more likely to moonlight if 1 they have low current incomes relative to their educational attainment and 2 they plan to purchase a house or a car during the next six months

multiple job holding in the united kingdom evidence from the british household panel survey this article examines the determinants of multiple job holding in the uk we address these issues using data from the first 11 waves of the british household panel survey bhps which covered the period from 1991 to 2001 evidence from the bhps does not support the hypotheses of main job hours constrained and main job insecurity we argue that the incentive for moonlighting in the uk is due to financial pressures and the desire for heterogeneous jobs the empirical work is carried out separately for men and women

when to risk it institutions ambitions and the decision to run for the u s house the health of any democratic system depends on political ambition to generate a steady supply of quality candidates for office because most models of candidate entry assume ambition rather than model it previous research fails to understand its roots in individual and institutional characteristics we develop a two stage model of progressive behavior that distinguishes between the formation of ambition for higher office and the decision to enter a particular race using data from a survey of state legislators we demonstrate that the intrinsic costs and benefits associated with running for and holding higher office shape ambitions but do not influence the decision to run for progressively ambitious legislators the second stage decision is a strategic choice about when to run rather than whether to run our research highlights how institutional characteristics that foster progressive ambition also increase the likelihood that national or local political conditions will be translated into meaningful choices at the ballot box

the puzzling pattern of multiple job holding across u s labor markets multiple job holding mjh rates differ substantially across u s regions states and metropolitan areas rates decrease markedly with respect to labor market size these patterns have been largely overlooked despite being relatively fixed over at least the past 20 years this article explores explanations for these persistent differences we account for roughly two thirds of the mean absolute deviation in mjh across local labor markets msas the results suggest that variation in mjh across labor markets is driven by labor market differences in job opportunities and worker preferences most important in explaining variation in mjh are msa industry and occupation structure ancestry shares commute times and to a lesser extent labor market churn

what s a losing party to do the calculus of contesting state legislative elections existing theories of contesting elections typically treat all potential challengers as identical while under playing the importance of political parties and primary contests we offer a theory addressing these issues based on how the various actors in the process define and evaluate the probability of winning an election and the value of the office being contested we test our theory by estimating a model predicting which of three responses a party that loses a legislative race makes in the next cycle nominating the same candidate nominating a new candidate or nominating no one we find substantial empirical support for our theory

multiple job holding the artist s labour supply approach this article analyses a labour supply model in which individuals maximize a utility function that depends on leisure time consumption and time devoted to an activity that is termed artistic this activity may generate income that depends nonlinearly on hours dedicated to it the individual can also work in the labour market an activity that does not increase utility by itself in exchange for an hourly wage and obtain income not related to hours conditions are obtained that sort individuals into two groups part time and full time artists deriving their labour supply functions in both activities the predictions of the model are tested empirically using a sample of musicians from a uruguayan performing rights society increases in outside wages drive part time artists out of the labour market but no significant increase in arts hours is detected higher nonlabour income also reduces nonarts work time of part time artists but does not have a significant impact in their arts hours conversely arts

quality counts extending the strategic politician model of incumbent deterrence competitive elections are essential to representative democracy competition in u s house elections is low in part because incumbents have strategic advantages that deter strong potential candidates from running many observers conclude that incumbents retain their seats without full accountability to the electorate but the mechanisms of deterrence have never been fully explored from the perspective of strong potential candidates based on a survey of potential house candidates designed to capture perceptions of incumbents personal quality and reelection prospects we find strong evidence for the strategic politicians thesis black 1972 jacobson and kernell 1983 we extend the logic of the strategic model first by showing that incumbents reelection prospects are affected by their personal quality and second by demonstrating that incumbents personal qualities deter strong challengers from running independent of their electoral prospects our findings prompt us to suggest revisions to our understanding of competition and representation in contemporary house elections

moonlighting multiple motives and gender differences this paper examines the incidence and reasons for moonlighting with a focus on gender differences the study specifies and estimates a bivariate probit model of labour supply and the decision to hold more than one job it is found that the factors leading men and women to moonlight are similar a wage decomposition analysis reveals that 93 percent of the differential between male and female moonlighters wages is not explained by differences in characteristics and little connection is found between an individual s human capital and their moonlighting wage finally it is found that moonlighters are less likely to report their income

a new utility consistent econometric approach to multivariate count data modeling summary in the current paper we propose a new utility consistent modeling framework to explicitly link a count data model with an event type multinomial choice model the proposed framework uses a multinomial probit kernel for the event type choice model and introduces unobserved heterogeneity in both the count and discrete choice components additionally this paper establishes important new results regarding the distribution of the maximum of multivariate normally distributed variables which form the basis to embed the multinomial probit model within a joint modeling system for multivariate count data the model is applied to analyzing out of home non work episodes pursued by workers using data from the national household travel survey copyright 2014 john wiley sons ltd

a time series analysis of labour absence in australia the authors find evidence from australian time series data supporting two hypotheses about the determination of labor absence first labor absence modeled in a utility maximizing framework that stresses the opportunity cost of labor absence receives considerable support from the data variables that change the slope and or shift the budget constraint facing workers affect labor absence secondly the authors find tentative evidence that coercive or difficult work environments which apparently affect job satisfaction adversely affect labor absence in particular it appears that labor absence is a leading indicator of a deteriorating industrial relations environment characterized by increased industrial disputation copyright 1989 by mit press

wage differentials and moonlighting by civil servants evidence from cote d ivoire and peru as part of their efforts to reduce fiscal deficits many governments have allowed public sector salaries to erode often on the assumption that government workers are overpaid vis a vis those in the private sector that assumption is tested by analyzing public private pay differentials in cote d ivoire and peru switching regressions models are estimated using full information maximum likelihood fiml and the results are compared to those obtained using ordinary least squares ols techniques the ols yields seriously biased estimates of the pay structure suggesting that public wages are higher than private wages the fiml estimates show the opposite our probit analysis also shows that the wage disadvantage of civil servants is a determinant of the greater prevalence of moonlighting among public than private employees the evidence suggests that reductions in employment rather than pay while being less palatable in the short term will be more effective in the long run

unit commitment with dual variable constraints a new unit commitment model is proposed for market economies with some form of indivisibilities nonconvexities coordination in electricity pool auction markets with unit commitment is a conspicuous example this presentation applies to a single time period unit commitment with no network the new formulation includes a market coordinator who collects the sale and purchase bids and determines the optimal solution that balances the total generation with the forecast demand a solution to the new commitment model is said to be optimal if it maximizes the monetary margin of every accepted production unit while minimizing the sum of the margins of the unaccepted units that would achieve positive margins at the prevailing market price the new unit commitment model produces a market price that is the system wide marginal bid cost some preliminary results are reported considering the single period unit commitment problem which provide some insights into the adequacy of the proposed approach as well as its economic implications as a tool for managing restructured energy systems

is it all about money an examination of the motives behind moonlighting multiple job holding is an important labour market phenomenon in this article we examine individuals motives for multiple job holding specifically we estimate an empirical model of the motivation for moonlighting assuming that individuals hold a second job for either financial or for nonpecuniary motives our results contribute to a better understanding of multiple job holding we find that multiple job holding is used by individuals as a way to deal with the financial difficulties or the increased financial commitments in their household individuals are more likely to moonlight for money in the early stages of their adult life finally individuals with more labour market experience are more likely to moonlight for pecuniary than nonpecuniary reasons

the shadow margins of labor market slack we use a mix of new and existing data to develop the aggregate hours gap ahg a novel measure of labor market underutilization our measure differentiates individuals by detailed categories of labor market participation and uses data on their desired work hours as a measure of their potential labor supply we show that desired hours vary widely by demographics and detailed labor force status and that the gap between desired and actual work hours is strongly positively correlated with reported search effort the aggregate hours gap suggests a more sluggish labor market recovery since the great recession than either the official unemployment rate or alternative measures of labor market underutilization modest amounts of underutilization among the part time employed and a substantial degree of underutilization among those out of the labor force account for the disparity the aggregate hours gap also does well in accounting for wage movements over our sample period

strategic politicians and unresponsive voters t0 resolve the paradoxical finding that economic conditions and presidential popularity powerfully relate to quadrennial movement in the house vote but explain little individual voting variation jacobson and kernell have advanced their strategic politicians model of midterm elections purportedly the early year political environment helps determine how many of a party s strong potential contenders risk challenging incumbents voters in turn respond to the quality of candidates before them in november and thus indirectly reward the party favored by this early year environment despite its current prominence however the theory does not stand up to empirical investigation a time series equation of midterm outcomes regressed on early year national conditions does not fare particularly well when contrasted with comparable equations assuming direct effects voting furthermore challenger quality has only a weak influence on individual voters subordinate in fact to the effects of economic attitudes and presidential evaluations

tanzanian formal sector workers participation in informal production a theoretical model is developed explaining formal sector workers participation in the informal sector a reduced form informal sector participation function is derived from a specific utility function a specific informal sector production function and a specific informal sector earnings function the participation function can be estimated consistently and provides a solution to the problem that informal sector wages in developing countries are hard to observe a sample of tanzanian formal sector workers is used to estimate the participation function a majority of tanzanian formal sector workers participate in informal production participation in informal production is inversely related to household income to living in dar es salaam and to being a mother with small children participation is positively related to age and multiple job holding seems to play a very different role in the transition from work to retirement in tanzania compared to industrialized countries