Nonlinear stochastic effects of substitution — an evolutionary approach

Technological innovations have been investigated by means of substitution and diffusion as well as evolution models, each of them dealing with different aspects of the innovation problem. In this paper we follow the well known research traditions on self-organisation models of complex systems. For the first time in the literature we show the existence of a specific niche effect, which may occur in the first stage of establishment of a new technology. Using a stochastic Master equation approach, we obtain analytical expressions for the survival probabilities of a new technology in smaller or larger ensembles. As a main result we demonstrate how a hyperselection situation might be removed in a stochastic picture and thresholds against the prevailing of a new technology in a step-by-step process can be overcome.     

The struggle for space: Past and future of the space race

This article is geared toward shedding some more light on what may be the next space race and its contours.Space flight is undoubtedly a human achievement of the second half of the 20th century, and probably the most audacious one of the past century. The space race started suddenly in the 1950s and has grown explosively during the following two decades, but decreased steadily after the 1970s. After the 1990s, however, we have seen a shy rebirth of space-related activities, when many other actors (states) entered the stage, adding up to the agonizing role of the two-actor piece that we have witnessed during the so-called Cold War.The opening years of the 21st century provided a more complex narrative for space exploration. At the start of the new millennium a new technosphere [1] emerged, dominated by what is used to be called as the Information and Communications Technologies (ICT), with the Internet playing the leading role among the bandwagon of technological novelties that appeared during the twilight of space activities. In despite of the fact that artificial satellites represent the very backbone of the global communications system, space activities seem to play a secondary role amidst the apparently accelerated rate of change concerning the technological systems of the present technosphere. But, as it is demonstrated in this paper, things are changing, and very probably a renewed space race will unfold in the coming decades.A question may be placed: what happened? Why the Earth stood still with regard to the race toward the cosmos? Answer: futurists, even prestigious ones like Herman Kahn and Arthur Clarke, did not consider the existence of socioeconomic long waves (Kondratieff waves, or K-waves for short) with their two decades long economic downturn, which has contributed to the deceleration of space-related activities.Analyzing the worldwide evolving scenario of space-related activities during the last eighty years under the framework of the succeeding K-waves and applying some technological forecasting tools, namely the logistic analysis, technological surveillance and intensive data mining, scrutinizing more than 7500 events occurred in the period 1930–2010 related with space activities, it is demonstrated that the space race like the one that we have witnessed until now is a natural growth process that has saturated at the dawn of this century. The same analysis demonstrates that a new growth process in this field might be nowadays under way with contours very different from that imagined by futurists and science fiction writers sixty years ago. Also the main trends in the usage of launching vehicles and satellites are framed and discussed in this paper.     

From unemployed to entrepreneur: The role of the absolute bequest motive

Using the British Household Panel Survey, this paper finds that inheritance has a concave effect on the hours worked by male entrepreneurs. Receiving an inheritance increases the labor supply of unemployed male entrepreneurs; however this effect becomes smaller for higher inheritances.     

Bayesian selection of technology assumptions for the transformation from supply-use to input–output tables

ABSTRACT

In the construction of input–output models from supply-use tables, technology assumptions disambiguate how an industry uses inputs in the production recipe of multiple outputs. This paper uses Bayes' theorem to select technology assumptions, taking into account empirical observations. The paper presents a formulation to explore hybrids between product and industry technology assumptions in product-by-product tables. We then present Markov chain Monte-Carlo techniques to implement the Bayesian method for selecting technology assumptions. We apply the method in a case study using Eurostat supply-use tables of 2004 and 2005, exhibiting a volume of secondary products of less than 13%, and 59 products and industries per country. The results show that the choice of technology is not important, given that there is no strong evidence in favour of any of them.     

Las diferencias salariales entre países en la Unión Europea

Se investigan los determinantes de las brechas salariales entre países de la Unión Europea a lo largo de la distribución salarial según la propuesta metodológica de Firpo, Fortin y Lemieux (2009) y de Fortin, Lemieux y Firpo (2011). Los efectos de estructura salarial y de composición inciden en las diferencias salariales, aunque el primero de una manera más marcada. Este efecto se deriva de las diferencias entre factores desconocidos, mientras que el efecto de composición se explica principalmente por las diferencias en materia de educación, proporción de trabajadores con responsabilidades de supervisión, estructura ocupacional y, en menor medida, estructura de la actividad económica.     

Yield curves from different bond data sets

Review of Derivatives Research - It is well known that zero coupon rates are not observable variables. Their estimation process may be cumbersome and time consuming. We explore the extent to which...     

Macro‐Hysteresis Test for Brazilian Exports of Manufactured Products: A threshold Panel Approach

This study tests for macro‐hysteresis in Brazilian exports of manufactured products using a panel model with threshold parameters according to Hansen. To test hysteresis, the threshold variables are built based on studies by Parslei and Wei, and Penkova. There is evidence of asymmetrical responses, with more pronounced increases in the price elasticity of demand during periods of high depreciation of the exchange rate compared with periods of more pronounced currency appreciation. We also estimate the relative price intervals that correspond to the inaction band.     

Liquidity risk and maturity management over the credit cycle

We show that firm demand-side factors are strong drivers of procyclical refinancing behavior over the credit cycle using novel data from the Shared National Credit program. Firms are more likely to refinance early when credit conditions are good to keep the effective maturity of their loans long and hedge against having to refinance in tight credit conditions. High credit quality firms are better able to hedge, making their refinancing propensity more sensitive to credit cycles than less creditworthy firms. There is a strong relationship between refinancing a loan, and subsequent growth in capital expenditure, especially when a loan is refinanced early.     

Knowledge spillovers and strategic entrepreneurship: what researches and approaches?

International Entrepreneurship and Management Journal - Based on the need for companies to remain competitive and dynamic in a constantly changing environment, this systematic review on knowledge...     

A single currency for the Economic Community of West Africa? An economic assessment

This paper assesses the economic support for the creation of an Economic Community of West African States (ECOWAS) monetary union encompassing all its 15 members, an objective that was set more than 30 years ago. In line with previous empirical research, our conclusion is that the adoption of a common currency by the whole region is not recommended. This work takes a step forward and assesses alternative ways to reduce the current number of currencies in circulation in the Community. Based on our results, we suggest (i) the merging of the currencies of Guinea, Liberia and Sierra Leone into a single currency and (ii) the Gambia to join the West African Economic and Monetary Union (WAEMU).