THE IMPACT OF BESTSELLER RANK ON DEMAND: EVIDENCE FROM THE APP MARKET*

This article uses daily data on the ranking by sales of the top 100 apps sold through Apple’s App Store to provide evidence of the causal impact of today’s bestseller rank information on tomorrow’s demand. The estimates indicate that the willingness to pay of consumers is about $4.50 greater for a top ranked app than for the same unranked app. The results also indicate that the effects of bestseller status on willingness to pay decline steeply with rank at the top ranks, but remain economically significant for the apps in the first half of the top 100 list.     

The economics of harvesting predator-prey systems

The economics of harvesting a renewable natural resource is well-developed in a framework where environmental conditions of the species looked at are kept constant. For the case of two interacting species as a prey-predator relationship the economics of harvesting one of the two species is analyzed. Questions of existence, uniqueness, and stability are looked at. Applying optimal control theory, a modified golden rule of harvesting is derived.     

A project portfolio risk‐opportunity identification framework

This article introduces a framework to identify risks and opportunities during portfolio risk management that helps to decrease the uncertainty of achieving the strategic goals of the organization. The final output of the framework is a portfolio risk‐opportunity register, which highlights the potential events that could impact the achievement of the goals. An illustrative example of how risk‐opportunity identification can be conducted within this framework is also exposed. In spite of being theoretical in nature, the model contributes to the risk management domain applied specifically to project portfolio management, opening the possibility of further research for its verification.     

Teacher shortages and the business cycle

The ability of the public sector to recruit skilled workers is important for the quality of public sector services. Centralized and rigid pay systems in the public sector might reduce labour supply and lead to shortages of qualified personnel in areas and periods with strong outside labour markets. This paper shows that teacher shortages measured by the share of teachers without approved education are strongly procyclical in Norway. Using a large panel of Norwegian local governments for 1981–2002 and exploiting the rigid wage system, we find a sizeable negative relationship between teacher shortages and the regional unemployment rate.     

Determinants of CEO and Board Turnover

The purpose of this paper is twofold. First, to document changes in top management and board of directors in Danish firms during 1996–98. Second, to examine whether these changes are related to the performance of firms during the preceding years. Our study differs from earlier investigations in that we not only consider removal of CEOs but also turnover of board chairmen and board members. We find that turnovers of CEOs, board chairs and members have a number of common determinants like firm size and age of the firm. Risks of removals increase with lower rates of solvency but are unaffected by profitability changes. The hypothesis that competition increases the turnover risk is not supported by the estimations.     

Economic growth,business cycles and products variety: exploring the role of demand satiety

The paper presents a model of economic growth based on a population of heterogeneous and interacting agents. This model succeeds to generate - in a single framework - GDP growth and cycles as well as product life cycles. Contrary to the existing literature, we find that an increasing variety of consumer goods is not a necessary condition for sustaining the economic growth when consumers are subject to satiation. Indeed, intensive creative-destruction - that is an intensive process of sectors births and deaths - appears to be a more powerful growth engine. We also find that changing consumers’ satiety thresholds is likely to affect the nature of the correlation between the cyclical components of macroeconomic time series.     

The role of trade openness and investment in examining the energy-growth-pollution nexus: empirical evidence for China and India

Most of the existing literature dealing with the relationship between carbon emissions, energy consumption and economic growth either suffers from ignoring relevant variables such as trade openness or investment, or suffers from using econometric methods that are unable to distinguish between short- and long-term causality and are not robust to the degree of integration of time series used for the analysis. This article suggests using the autoregressive distributed lag approach along with additional explanatory variables such as measures of trade and investment to shed a new light on the link between emissions, energy consumption and income in the two largest and energy-intensive developing economies: China and India. Our results, over the 1971–2009 period, provide evidence that investment plays a major role in shaping the relationship between carbon emissions, energy consumption and income in China while this is not the case in India. Furthermore, trade openness is found to play a key function in the short term in China but does not contribute to the emissions-energy-growth scenario in India.     

On the Stochastic Properties of Carbon Futures Prices

Pricing carbon is a central concern in environmental economics, due to the worldwide importance of emissions trading schemes to regulate pollution. This paper documents the presence of small and large jumps in the stochastic process of the CO $_2$ futures price. The large jumps have a discrete origin, i.e. they can arise from various demand factors or institutional decisions on the tradable permits market. Contrary to the existing literature, we show that the stochastic process of carbon futures prices does not contain a continuous component (Brownian motion). The results are derived by using high-frequency data in the activity signature function framework (Todorov and Tauchen in J Econom 154:125–138, 2010; Todorov and Tauchen in J Bus Econ Stat 29:356–371, 2011). The implication is that the carbon futures price should be modeled as an appropriately sampled, centered Lévy or Poisson process. The pure-jump behavior of the carbon price might be explained by the lower volume of trades on this allowance market (compared to other highly liquid financial markets).     

Does transparency reduce political corruption?

Does a better monitoring of officials' actions (transparency) lower the incidence of corruption? Using a common agency game with imperfect information, we show that the answer depends on the measure of corruption that one uses. More transparency lowers the prevalence of corruption but raises the average bribe as it motivates the corruptor to bid more aggressively for the agent's favor. We show that transparency affects the prevalence of corruption at the margin through a competitive effect and an efficiency effect.