In this paper we build a pragmatic model on competition in oligopoly markets. To achieve this goal, we use an approach based on studying the response functions of each market participant, thus making it possible to address both Cournot and Bertrand industrial structures with a unified formal method. In contrast to the restrictive theoretical constructs of duopoly equilibrium, our study is able to account for real-world limitations like minimal sustainable production levels and exclusive access to certain resources. We prove and demonstrate that by using carefully constructed response functions it is possible to build and calibrate a model that reflects different competitive strategies used in extremely concentrated markets. The response functions approach makes it also possible to take into consideration different barriers to entry. By fitting to the response functions rather than the profit maximization of the payoff functions problem we alter the classical optimization problem to a problem of coupled fixed points, which has the benefit that considering corner optimum, corner equilibria and convexity condition of the payoff function can be skipped.

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In this paper we generalize Hardy–Rogers maps in the context of coupled fixed points. We comment on the symmetry of some of the coefficients involved in the Hardy–Rogers condition, and thus, we deduce a simpler formula. We generalize, with the help of the obtained main theorem, some known results about existence and uniqueness of market equilibrium in duopoly markets. As a consequence, we ascertain that the equilibrium production should be equal for both market participants provided that they have symmetric response functions. With the help of the main theorem, we investigate and enrich some recent results regarding market equilibrium in duopoly markets. We define a generalized response function that includes production and surpluses. Finally, we illustrate a possible application of the main result in the investigation of market equilibrium when the payoff functions are non-differentiable.

The term 'waithood' has become increasingly used to describe the situations of 20-something males and females throughout the Middle East and North Africa (MENA). The suggestion is that, following a youth life stage, young adults' lives stall due to males' inability to obtain sufficiently stable and salaried employment to enable them to head new family forming households, which leaves young women, most of whom do not enter the labour market, unable to marry. We use quantitative and qualitative evidence from research in three NorthWest Africa countries (Algeria, Morocco and Tunisia) to argue that the situation is more nuanced. We conclude that youth life stage transitions in present-day MENA exhibit a region-specific combination of features. The combination is atypical globally, but neither intolerable for young people in MENA nor unsustainable societally.

We present a possible kind of generalization of the notion of ordered pairs of cyclic maps and coupled fixed points and its application in modelling of equilibrium in oligopoly markets. We have obtained sufficient conditions for the existence and uniqueness of coupled fixed in complete metric spaces. We illustrate one possible application of the results by building a pragmatic model on competition in oligopoly markets. To achieve this goal, we use an approach based on studying the response functions of each market participant, thus making it possible to address both Cournot and Bertrand industrial structures with unified formal method.We show that whenever the response functions of the two players are identical, then the equilibrium will be attained at equal levels of production and equal prices. The response functions approach makes it also possible to take into consideration different barriers to entry. By fitting to the response functions rather than the profit maximization of the payoff functions problem we alter the classical optimization problem to a problem of coupled fixed points, which has the benefit that considering corner optimum, corner equilibrium and convexity condition of the payoff function can be skipped.

This paper focuses on modelling environment changes in a way that allows to price weather derivatives in a flexible and efficient way. Applications and importance of climate and weather contracts extends beyond financial markets and hedging as they can be used as complementary tools for risk assessment. In addition, option-based approach toward resource management can offer very special insights on rareevents and allow to reuse derivative pricing methods to improve natural resources management. To demonstrate this general concept, we use Monte Carlo and stochastic modelling of temperatures to evaluate weather options. Research results are accompanied by R and Python code.

This paper presents evidence from interviews in 2015-2016 with a nationally representative sample of Tunisia's 15-29 year olds. We focus on the sample's political participation and orientations during the revolution of 2011 and subsequently. We find that just 6.6 percent of those aged 15-24 at the time played any direct part in the 'events of 2011'. Political engagement then and subsequently is shown to have been influenced most strongly by a university education and growing up in a politically engaged family. In 2015-2016, young people were overwhelmingly pro-democracy, supported equal opportunities and status for the sexes, and endorsed values of self-expression, but attached equal importance to economic security and betterment, felt that their country's traditions should be maintained and respected, and were personally religious, though three-quarters wanted religion to be kept out of politics and government. Although Tunisia is the sole Arab Spring country to emerge with a still functioning (in 2017) multi-party democracy, we find that in 2015-2016, the majority of young people did not trust their elected politicians. Our survey findings suggest explanations for the paradox between young Tunisians' overwhelming support for democracy alongside intense disappointment with the outcomes.