The instability principle revisited: an essay in Harrodian dynamics

Abstract

Harrod's contribution to economic dynamics is very often reduced to the dynamic equation whose character is unstable. Growth theory and cycle theory based on Harrod's contributions aimed at reducing this instability. Following Harrod, who was strongly opposed to the ‘knife-edge’ interpretation, we define the warranted rate of growth as a ‘moving equilibrium’ and focus on its interaction with the effective rate of growth. Our simple Harrodian model generates various dynamics from stable path, to growth cycle and corridor of stability.     

A re-examination of the “zero is enough” hypothesis in the emergence of financial stylized facts

In recent years, a growing literature has claimed that the market microstructure is sufficient to generate the so-called stylized facts without any reference to the behaviour of market players. Indeed, qualitative stylized-facts can be generated with zero-intelligence traders (ZITs) but we stress that they are without any quantitative predictive power. In this paper we show that in most of the cases, such qualitative stylized facts hide unrealistic price motions at the intraday level and ill-calibrated return processes as well. To generate realistic price motions and return series with adequate quantitative values is out-of-reach using pure ZIT populations. To do so, one must increasingly constrain agents?? choices to a point where it is hard to claim that their behaviour is completely random. In addition we show that even with highly constrained ZIT agents, one cannot reproduce real time series from these. Except in a few cases, first order moments of ZITs never equal real data ones. We therefore claim that stylized facts produced by means of ZIT agents are useless for financial engineering.     

Weighted majoritarian rules for the location of multiple public facilities

We consider collective decision problems given by a profile of single-peaked preferences defined over the real line and a set of pure public facilities to be located on the line. In this context, Bochet and Gordon (2012) provide a large class of priority rules based on efficiency, object-population monotonicity and sovereignty. Each such rule is described by a fixed priority ordering among interest groups. We show that any priority rule which treats agents symmetrically — anonymity — respects some form of coherence across collective decision problems — reinforcement — and only depends on peak information — peak-only — is a weighted majoritarian rule. Each such rule defines priorities based on the relative size of the interest groups and specific weights attached to locations. We give an explicit account of the richness of this class of rules.     

Role and impact of the environment on entrepreneurial learning

Abstract

This article is presenting an overview of the literature devoted to entrepreneurial learning and, more specifically, those research bringing environmental elements into the study of the entrepreneurial learning process. Then, it shows how each of the four Special Issue selected research papers contribute to enhancing our knowledge of the complexity of the learning process vis-à-vis entrepreneurial processes placed in context. By doing this, it makes an attempt to explain the specific context behind each contribution as well as presenting the wider context. Finally, the article is suggesting a set of key challenges and research pathways that might be explored in the future.     

Iterated potential and robustness of equilibria

For any given set-valued solution concept, it is possible to consider iterative elimination of actions outside the solution set. This paper applies such a procedure to define the concept of iterated monotone potential maximizer (iterated MP-maximizer). It is shown that under some monotonicity conditions, an iterated MP-maximizer is robust to incomplete information [A. Kajii, S. Morris, The robustness of equilibria to incomplete information, Econometrica 65 (1997) 1283-1309] and absorbing and globally accessible under perfect foresight dynamics for a small friction [A. Matsui, K. Matsuyama, An approach to equilibrium selection, J. Econ. Theory 65 (1995) 415-434]. Several simple sufficient conditions under which a game has an iterated MP-maximizer are also provided.     

Reassessing forest products demand functions in Europe using a panel cointegration approach

In a panel of European countries, we analyse paper products, sawnwood and wood panels consumption data. With this object, we use a classical demand model where national consumption depends on real GDP and real prices. In contrast to previous panel estimations in the literature, we highlight non-stationarity time series which can lead to spurious regressions. We explicitly take into account the issue by using recent panel cointegration techniques. Cointegration is present for printing paper and fibreboard, though less clear cut for other products. Then we estimate demand elasticities and find that GDP elasticities are significantly lower than estimates from the literature. Finally, we simulate the implications of modified demand elasticities by using a partial equilibrium model of the forest sector. For most products, changes in elasticities would lead to lower projected demand and lower prices over a 20-year time horizon. Lower demand for solid wood and wood fibre would lead to less tensions with fuel wood- and wood-based chemical markets. In a context of rising interest for renewable bio-based products, updated long-term demand models contribute to the analysis of the forest sector’s sustainability.     

Measuring sustainability risks: A rational myth?

The objective of this paper is to investigate the rigorousness and reliability of sustainability rating agencies' evaluation of corporate sustainability risks. Using grounded theory, this study conducts a qualitative analysis of 32 semi‐structured interviews with practitioners involved in this activity and shows the trade‐offs and rational myths underlying this evaluation process. The image of rationality and rigorousness projected by sustainability risk measurements is mostly intended to address the increasing institutional pressures for reliable and comparable information, particularly from institutional investors and socially responsible investment decision makers. Nevertheless, risk analysts face serious challenges due to the lack of reliable information, the unpredictability of sustainability risks, the methodological issues related to the measurement process, and the complexity and context‐dependency of risk assessment. These challenges call into question the official and optimistic rhetoric of rating agencies. This study contributes to the literature on sustainability risks and rational myths in organizations. Managerial implications and avenues for future research are also discussed.     

Insiders vs. outsiders in the hotel sector

We investigate whether entering an official hotel classification system is as lucrative as suggested in the tourism management literature. Indeed, in countries in which the official hotel classification system is voluntary, a substantial fraction of hotels choose not to enter the system, and are outsiders. Considering that being classified (being insider) as a predictor of the rate structure may raise an endogeneity issue, we apply the recursive semi-ordered probit model to control for endogeneity and appropriately assess the effect of being classified on price rates. Using a sample of 357 hotels of Corsica, we show that, in contrast to previous research, classification does not provide any rate premium. We also fully derive conditional probabilities and partial effects on differences in conditional probabilities within the recursive semi-ordered probit model.     

European Agricultural Science Funding: Examining Trends and Prospects

Proper evaluation of the impact of agricultural research requires data on how much has been spent to achieve its desired effects on productivity, efficiency and environmental quality. However, official statistics on aggregate volumes of research expenditure, at both European and national levels, are intermittently available and most data collected for private research are not fully compatible with data for public research. This study in 20 European countries in 2014 defines the different concepts at international level, and assesses coverage across countries, using secondary data and key informant interviews. Coverage is unequal by country and type of measure, the lowest coverage being for agriculture as a socioeconomic objective. We depict recent trends in public agricultural research, which differ by country. We then formulate three policy options and recommendations for their implementation to improve the monitoring of agricultural research investment in Europe: 1) make compulsory in the EU statistical system the collection of statistics on agricultural research expenditure using the same metrics for all sectors of performance; 2) develop a specific survey in the Commission to obtain data directly from research organisations; 3) prepare annual reviews of agricultural research expenditures at Member State level, including both quantitative and qualitative information on agricultural research activities.