Saturation and alternate pathways in four-wave mixing in rubidium

We have examined the frequency spectrum of the blue light generated via four-wave mixing in a rubidium vapor cell inside a ring cavity. At high atomic density and input laser power, two distinct frequency components separated by $116 \pm 4$ MHz are observed, indicating alternate four-wave mixing channels through the $6p_{3/2}$ hyperfine states. The dependence of the generated light on excitation intensity and atomic density are explored, and indicate the primary process has saturated. This saturation results when the excitation rate through the 6p state becomes equal to the rate through the 5p state, giving no further gain with atomic density while a quadratic intensity dependence remains

Human well-being and causality in social epidemiology

This paper discusses the work of Ballas and Dorling on life events and happiness. I believe epidemiologists have things they could learn from economists (and vice versa). Here I emphasize the issue of how to establish causality, and try to suggest some ways forward

Shame and Attributability

Responsibility as accountability is normally taken to have stricter control conditions than responsibility as attributability. A common way to argue for this claim is to point to differences in the harmfulness of blame involved in these different kinds of responsibility. This paper argues that this explanation does not work once we shift our focus from other-directed blame to self-blame. To blame oneself in the accountability sense is to feel guilt and feeling guilty is to suffer. To blame oneself in the attributability sense, it will be argued, is to feel shame and feeling shame is also to suffer. The different control conditions cannot be explained by a difference in the harm of blame. Instead, this paper argues that accountability and attributability are governed by different kinds of appropriateness: an agent S is accountability blameworthy for X only if S deserves to feel guilty; an agent S is attributability blameworthy for X only if it is fitting that S feels shame for X

Private Versus Public Health Care in a National Health Service

This paper study the interplay between private and public health care in a National Health Service. We consider a two-stage game, where at stage one a Health Authority sets the public sector wage and a subsidy to (or tax on) private provision. At stage two physicians decide how much to work in the public and the private sector. We characterise different equilibria depending on the Health Authority's objectives, the physicians' job preferences, and the cost efficiency of private relative to public provision of health care. We find that the scope for a mixed health care system is limited when physicians are indifferent between working in the public and private sector. Competition between physicians triggers a shift from public provision towards private provision, and an increase in the total amount of health care provided. The endogenous nature of labour supply may have counter-intuitive effects. For example, a cost reduction in the private sector is followed by a higher wage in the public sector.health care, mixed oligopooly, physicians

Gatekeeping in health care

We study the competitive effects of restricting direct access to secondary care by gatekeeping, focusing on the informational role of gatekeeping general practitioners (GPs). We consider a secondary care market with two hospitals choosing the quality and specialisation of their care. GPs perfectly observe the diagnosis of a patient and the exact characteristics of the secondary care market. Patients are either informed or uninformed when accessing the hospital market. We consider two distinct cases: first, we let the fraction of informed patients be exogenous, implying that the regulator can only influence patients' decision of consulting a GP by making this compulsory ('direct gatekeeping'). Second, we endogenise this fraction by assuming GP consultation to be costly for the patient. Then the reulator can influence the GP attendance rate through the regulated price ('indirect gatekeeping'). A main finding of the paper is that strict gatekeeping may not be socially desirable, even if it is costless.Gatekeeping; Imperfect information; Quality competition; Product differentiation; Price regulation

Direct-to-Consumer Advertising in Pharmaceutical Markets

We study effects of direct-to-consumer advertising (DTCA) in a market with two pharmaceutical firms providing horizontally differentiated (branded) drugs. Patients varying in their susceptability to medication are a priori uninformed of available medication. Physicians making the prescription choice perfectly identify a patient’s most suitable drug. Firms promote drugs to physicians (detailing) to influence prescription decisions and, if allowed, to consumers (DTCA) to increase the awareness of the drug. The main findings are: Firstly, firms benefit from DTCA only if prices are regulated. On the one hand, DTCA reduces the physicians’ market power and thus detailing expenses, while, on the other, it triggers price competition as a larger share of patients are aware of the alternatives. Secondly, under price regulation DTCA is welfare improving as long as the regulated price is not too high. Under price competition, DTCA is harmful to welfare unless detailing is wasteful and the drugs are poor substitutes.Advertising; Pharmaceuticals; Oligopoly

Health inequality in Nordic welfare states - more inequality or the wrong measures?

Several empirical papers have indicated that the health inequalities in the Nordic welfare states seem to be at least as high as health inequalities in other European countries even if the Nordic states have a more egalitarian income structure. This is in contrast to standard economic theory that predicts that income equality should lead to health equality everything else equal. We argue that there may be a straightforward explanation why Nordic countries appear to have a steeper health gradient than other countries. Health and income are related, and the correlation between income and health will be weaker the more noise there is in terms of other determinants of income. If the Nordic countries have succeeded in reducing the impacts of other determinants of income, like social class, then the correlation between income and health will be stronger in the Nordic countries. This story also holds for other measures of health inequality. However, if the causality is running from income to health, there may be a reason why health inequality is higher in more egalitarian states based on cognitive stress theory. We argue however, that even in this case the difference between Nordic states and the rest of Europe may be a result of poor measures.Health inequality; socio-economic status; Nordic welfare states; egalitarian countries

Direct to Consumer Advertising in Pharmaceutical Markets

We study effects of direct-to-consumer advertising (DTCA) in the prescription drug market. There are two pharmaceutical firms providing horizontally differentiated (branded) drugs. Patients differ in their susceptibility to the drugs. If DTCA is allowed, this can be employed to induce (additional) patient visits. Physicians perfectly observe the patients' type (of illness), but rely on information to prescribe the correct drug. Drug information is conveyed by marketing (detailing), creating a captive and a selective segment of physicians. First, we show that detailing, DTCA and price (if not regulated) are complementary strategies for the firms. Thus, allowing DTCA induces more detailing and higher prices. Second, firms benefit from DTCA if detailing competition is not too fierce, which is true if investing in detailing is sufficiently costly. Otherwise, firms are better off with a ban on DTCA. Finally, DTCA tends to lower welfare if insurance is generous (low copayments) and/or price regulation is lenient. The desirability of DTCA also depends on whether or not the regulator is concerned with firms' profit.marketing, pharmaceuticals, oligopoly

Direct-to-Consumer Advertising in Pharmaceutical Markets

We study effects of direct-to-consumer advertising (DTCA) in a mar- ket with two pharmaceutical firms providing horizontally dierentiated (branded) drugs. Patients varying in their susceptability to medication are a prioriuninformed of available medication. Physicians making the prescription choice perfectly identify a patient's most suitable drug. Firms promote drugs to physicians (detailing) to influence prescription decisions and, if allowed, to consumers (DTCA) to increase the awareness of the drug. The main Þndings are: Firstly, Þrms beneÞt fromDTCAonlyif prices are regulated. On the one hand, DTCA reduces the physicians™ market power and thus detailing expenses, while, on the other, it triggers price competition as a larger share of patients are aware of the alternatives. Secondly, under price regulation DTCA is welfare improving as long as the regulated price is not too high. Under price competition, DTCA lowers welfare unless detailing is wasteful and the drugs are poor substitutes.Advertising; Pharmaceuticals; Oligopoly

Optimal Fleet Size When National Quotas Can Be Traded

Assuming stochastic quotas for a fish stock that is shared between two nations, we find the optimal fleet size for one of them by maximizing expected profit under the assumption that national quotas can be traded and that stable national quotas is a political goal. As an example we use the Norwegian purse seiner fleet and the summer capelin fishery in the Barents Sea.Environmental Economics and Policy, International Development, International Relations/Trade, Resource /Energy Economics and Policy,