D11 - Consumer Economics: TheoryReturn

This paper examines the influence of relative income on the consumption function, particularly the issue of the precise quantification of the relationship between the propensity to consume and the position of the household in the income distribution represented just by relative income. Mainstream theory of consumption, though it is aware of this effect, for its focus primarily on the aggregate consumption, it doesn't pay much attention to this. However, if it is possible to accurately describe and quantify this so-called relative income effect, it will mean a relevant contribution to the explanation of individual consumption patterns or consumption of income categories. The aim of this work is to find, describe and precisely quantify the impact of relative income on the average propensity to consume on the example of Czech households. To achieve this goal, we use a regression estimation of the dynamic panel using GMM, where the individual panels are set as income categories of households. The results achieved unambiguously confirm the validity of the initial assumption about the existence of functional dependence of the propensity to consume on the relative income and thus it fully supports the idea of interdependent concept of utility and consumption.

Unconditional basic income should guarantee that all residents have sufficient material conditions for their existence. Compared to other existing social security programs, basic income is unique in its simplicity. It also supports the individuals' freedom of use of their disposible time. The article analyzes the expected impact of the introduction of an unconditional basic income on the labor market. It also compares basic income to other social security programs (wage subsidies, targeted social programs, a negative income tax and tax credits) on a theoretical level from the perspective of a recipient. Unconditional basic income's effects on labor supply would be rather negative. However, relative to other social security programs, unconditional basic income can guarantee a higher or the same utility level, but it may not motivate to participate in the labor market. Additional positives are transparency and lack of incentives to cheat. The prospect of lower administrative costs depends on the specific basic income scheme in question.

Energy efficiency improvements have become a major hope for decoupling the energy demand from economic growth and for achieving environmental goals. Nevertheless, the effectiveness of policies based on promoting energy efficiency may be undermined by behavioral responses. A more efficiently produced energy service becomes cheaper and economic theory then suggests that consumers should demand more of it, which will cause a loss of the potential technological saving. The phenomenon is called the rebound effect and it has become a focus of energy economists since early 80s. However, even today there is no clear consensus on its importance. Quantification of the rebound effect is mainly hampered by poor data availability and the comparison of results is not straightforward due to methodological differences. Our study concentrates right on the economic theory of the demand for energy services, definitions and their applicability to empirical estimation. It summarizes the state of knowledge and elaborates on plausible models for empirical quantification of the rebound effect which should bear consistent results.

Transitivity and dominance are key concepts built deep into the fundaments of most economic models of decision-making. One of the arguments in favour of using the two concepts is that they are normative, i.e., symptomatic of perfect, rational decision-making. This paper describes several specific axioms stemming from these concepts and appearing in axiomatic models of decision-making, gives possible arguments speaking for or against the normativeness of a given concept and adds examples of empirically observed violations of the concept by human decision-making. In the conclusion, it offers an assessment of whether the use of transitivity and dominance in economic models of decision-making is justified or not.

This paper reviews important approaches to discounting in economic modelling. It summarizes historical approaches and discusses why exponential discounting has been adopted as a widely accepted benchmark. The article then presents hyperbolic discounting as an alternative, while stresses different interpretation of discounting in positive and normative economics. In positive economics, the paper uses recent evidence to show that some observed regularities implied by exponential discounting are counterfactual and we illustrate different implications of the two approaches to discounting using numerical simulations of a stylized model of investment-consump- tion behaviour. It also concerns with applications of discounting in normative models of environmental economics. Many authors claim that exponential discounting, when used for long-term project evaluation, leads to an unfair treatment with generations living in a far future. We construct a model of optimal non-renewable resource exploitation to illustrate different normative implications of exponential and hyperbolic discounting.