Negative externalities as the engine of growth in an evolutionary context

We present a simple growth model which has two original features: the strategic context considered, which is an evolutionary game, and the growth mechanism described, in which growth is caused by negative externalities. The emphasis in this growth mechanism is evidently different from that placed on positive externalities by current endogenous growth models. In this model welfare depends on three goods: leisure, a free environmental renewable resource, and a non-storable output. The environmental resource is subject to negative externalities, that is, it is deteriorated by the production of the output. Faced with a forced reduction of the resource, agents may react by increasing the labor supply in order to produce and consume substitutes for the diminishing resource, i. e. they can raise their defensive expenditures. The increase in production and consumption that follows, i.e. growth, generates a further deterioration of the environmental resource, thus giving rise to a self-feeding growth process. The conditions under which multiple equlibria and Pareto-worsening growth dynamics arise, are analysed. Beside showing the logical possibility that negative externalities are the engine of growth, we suggest that the case analysed may be of practical relevance, i.e., that negative externalities may play an important role in many episodes of growth. This role is widely recognized by social sciences other than economics. We suggest that the model may be interpreted as a push development model and that it may also contribute to explain some aspects of growth in advanced countries

Indeterminacy, bifurcations and chaos in an overlapping generations model with negative environmental externalities

We analyze an overlapping generations model where agent’s welfare depends on three goods: leisure, environmental quality and consumption of a private good. We assume that the production process of the private good depletes the natural resource and that the consumption of the private good alleviates the damages due to environmental deterioration. In such context, we show that individuals’ reactions to environmental deterioration may lead to complex dynamics, in particular to the rise of periodic orbits and chaos.Defensive environmental expenditures; overlapping generations models; indeterminacy; undesirable economic growth

Negative externalities as the engine of growth in an evolutionary context

We present a simple growth model which has two original features: the strategic context considered, which is an evolutionary game, and the growth mechanism described, in which growth is caused by negative externalities. The emphasis in this growth mechanism is evidently different from that placed on positive externalities by current endogenous growth models. In this model welfare depends on three goods: leisure, a free environmental renewable resource, and a non-storable output. The environmental resource is subject to negative externalities, that is, it is deteriorated by the production of the output. Faced with a forced reduction of the resource, agents may react by increasing the labor supply in order to produce and consume substitutes for the diminishing resource, i. e. they can raise their defensive expenditures. The increase in production and consumption that follows, i.e. growth, generates a further deterioration of the environmental resource, thus giving rise to a self-feeding growth process. The conditions under which multiple equlibria and Pareto-worsening growth dynamics arise, are analysed. Beside showing the logical possibility that negative externalities are the engine of growth, we suggest that the case analysed may be of practical relevance, i.e., that negative externalities may play an important role in many episodes of growth. This role is widely recognized by social sciences other than economics. We suggest that the model may be interpreted as a push development model and that it may also contribute to explain some aspects of growth in advanced countries.Negative externalities; environmental defensive expenditures; undesirable economic growth; evolutionary games; happiness

Preserving or escaping? On the welfare effects of environmental self-protective choices

In modern societies individuals often try to alleviate their personal damages from environmental degradation by increasing their consumption of private goods. Although this “self-protective” behavior is very frequent in industrial economies, insufficient attention has been paid to its economic and environmental consequences. In this paper we show that such a behavior can give rise to a self-reinforcing growth process in which environmental degradation increases economic growth and vice-versa, leading the economy on a welfare-reducing path. For this purpose, we first provide several examples of environmental self-protective choices to give a heuristic view of this phenomenon and then examine their effects through a two-islands evolutionary model that leads the reader beyond a purely intuitive understanding of the argument. Although the proposed model is deliberately very simple, it may provide some interesting insights on an aspect that has been mainly ignored in the literature so far.Self-protective choices; defensive expenditures; environmental degradation; negative externalities; economic growth.

Online Networks, Social Interaction and Segregation: An Evolutionary Approach

We have developed an evolutionary game model, where agents can choose between two forms of social participation: interaction via online social networks and interaction by exclusive means of face-to-face encounters. We illustrate the societal dynamics that the model predicts, in light of the empirical evidence provided by previous literature. We then assess their welfare implications. We show that dynamics, starting from a world in which online social interaction is less gratifying than offline encounters, will lead to the extinction of the sub-population of online networks users, thereby making Facebook and alike disappear in the long run. Furthermore, we show that the higher the propensity for discrimination between the two sub-populations of socially active individuals, the greater the probability that individuals will ultimately segregate themselves, making society fall into a social poverty trap

The Solaria Syndrome: Social Capital in a Growing Hyper-technological Economy

We develop a dynamic model to analyze the sources and the evolution of social participation and social capital in a growing economy characterized by exogenous technical progress. Starting from the assumption that the well-being of agents basically depends on material and relational goods, we show that the best-case scenarios hold when technology and social capital both support just one of the two productions at the expenses of the other. However, trajectories are possible where technology and social interaction balance one another in fostering the growth of both the social and the private sector of the economy. Along such tracks, technology may play a crucial role in supporting a “socially sustainable” economic growth.Technology, Economic Growth, Relational Goods, Social Participation, Social Capital

Economic Growth, Technological Progress, and Social Capital: The Inverted U Hypothesis

We set up a theoretical framework to analyze the possible role of economic growth and technological progress in the erosion of social capital. Under certain parameters, the relationship between technological progress and social capital can take the shape of an inverted U curve. We show the circumstances allowing the economy to follow trajectories where the stock of social capital grows endogenously and unboundedly.Economic growth; social capital; social norms; technological progress.

The fragility of social capital

This paper addresses two hot topics of the contemporary debate, social capital and economic growth. Our theoretical analysis sheds light on decisive but so far neglected issues: how does social capital accumulate over time? Which is the relationship between social capital, technical progress and economic growth in the long run? The analysis shows that the economy may be attracted by alternative steady states, depending on the initial social capital endowments and cultural exogenous parameters representing the relevance of social interaction and trust in well-being and production. When material consumption and relational goods are substitutable, the choice to devote more and more time to private activities may lead the economy to a "social poverty trap", where the cooling of human relations causes a progressive destruction of the entire stock of social capital. In this case, the relationship of social capital with technical progress is described by an inverted U-shaped curve. However, the possibility exists for the economy to follow a virtuous trajectory where the stock of social capital endogenously and unboundedly grows. Such result may follow from a range of particular conditions, under which the economy behaves as if there was no substitutability between relational activities and material consumption.Social capital; Technical progress; Social sphere; Economic action; Well-being; Social poverty trap

Strategic interactions and heterogeneity in a overlapping generations model with negative environmental externalities

We analyze an overlapping generations model where individuals’ welfare depends on the stock of a free access environmental good E and on the consumption C of a private good. We assume that the production process of the private good depletes the natural resource but that specific investments alleviate these damages. In such context, we show that strategic behaviour and heterogeneity in preferences may be a source of complex dynamics.Heterogeneous agents; environmental externalities; overlapping generations models.

Structural change, economic growth and environmental dynamics with heterogeneous agents

This paper presents a model which takes into account two main factors that have been partially neglected by the economic development literature: the environmental externalities of human activities and agents' heterogeneity in terms of asset endowment and, consequently, in terms of income source and vulnerability to depletion of natural resources. This approach permits to shed light on agents' differences in feed-back mechanisms and interactions between their choices and environmental dynamics and allow us to propose a taxonomy of structural changes on the basis of distributive, environmental and economic impact. In such context, we identify under which conditions each structural change can occur. In par ticular, we identify new requirements for prompting positive structural changes, i.e. a movement of labour to capitalistic activities associated with poverty reduction and the alleviation of environmental pressures.Structural change; environmental externalities; eco- nomic development; poverty alleviation