In view of the extensive evidence of tight inter-relationships between spheroidal galaxies (and galactic bulges) with massive black holes hosted at their centers, a consistent model must deal jointly with the evolution of the two components. We describe one such model, which successfully accounts for the local luminosity function of spheroidal galaxies, for their photometric and chemical proper...

The article suggests that the emergence of FabLabs and other collaborative spaces innovation imply new modes manufacturing, based on a more social, inclusive, open approach than current industrial mass-production models. We argue are platforms social allowing different combinations interactions between industries individuals, through their activities around making (producing goods from raw mate...

This paper develops a dynamic model of innovation and international trade in which agents can direct their research efforts to specific goods the economy. Trade affects direction through its impact on expected market size for an invention, leading two-way relationship between technology absent standard quantitative Ricardian models. Following theory-consistent strategy estimate extent endogenou...

ارتقای بازدارندگی دفاعی مستلزم تولید گسترده و متنوع محصولات تجهیزات نظامی است که نیازمند به‌کارگیری ظرفیت‌ها قابلیت‌های وسیع صنعتی است. ازآنجاکه تصدی تملک همه این قابلیت‌ها منطقی اقتصادی نیست، بخشی از فعالیت‌های تولیدی در صنایع دفاعی، برون‌سپاری می­‌شود به ایجاد شبکه بزرگی تأمین‌کنندگان منجر شده گستردگی شبکه، تعاملات همکارانه بهبود عملکرد زنجیره تأمین را یک چالش جدی برای مدیران تبدیل کرده سازما...

This paper examines the impact of being an innovator on firm productivity in Taiwan. Using a panel of 48794 firms observed over the 1997-2003 period, and distributed across 23 industries, we compute TFP by estimating Translog production functions with conventional K, L, E, M inputs. We evaluate the impact of being an innovator on TFP using propensity score matching. The rationale is that, over ...

Using panel data from Spain Farinas and Ruano (IJIO 2005) test three hypotheses from a model by Hopenhayn (Econometrica 1992): (H1) Firms that exit in year t were in t-1 less productive than firms that continue to produce in t. (H2) Firms that enter in year t are less productive than incumbent firms in year t. (H3) Surviving firms from an entry cohort were more productive than non-surviving fir...

This paper examines the exporting behaviour of Russian manufacturers by considering the interaction of firm characteristics and external conditions. An important distinction is made between general exporting activity and export to developed countries. Firm features and specific export experience are found to be important in determining the international orientation of manufacturers and the dest...

We resurrect the question if improved business practices contributed to increased macroeconomic stability since the 1980s – the Great Moderation. While previous studies on the issue are limited to examining inventory management, we analyse the role of better supply chain management on enhancing firms’ ability to coordinate their production. By investigating ordering and backordering behaviour i...

This paper contributes to the flourishing literature on exports and productivity by using a unique newly available panel of exporting establishments from the manufacturing sector of Germany from 1995 to 2004 to test three hypotheses derived from a theoretical model by Hopenhayn (Econometrica 1992): (H1) Firms that stop exporting in year t were in t-1 less productive than firms that continue to ...

In this paper different formulae for the decomposition of aggregate productivity levels and changes are applied to a sample of German manufacturing firms that pertain to 11 different industries at a roughly two-digit level observed over the period 1981-1998. Productivity is measured by a nonparametric frontier function approach. The decompositions of productivity allow for an explanation of the...