We introduce a model of proportional growth to explain the distribution of business firm growth rates. The model predicts that it is exponential in the central part and depicts an asymptotic power-law behavior in the tails with an exponent ζ = 3. Because of data limitations, previous studies in...

We study the betweenness centrality of fractal and non-fractal scale-free network models as well as real networks. We show that the correlation between degree and betweenness centrality C of nodes is much weaker in fractal network models compared to non-fractal models. We also show that nodes of...

Complex systems can be characterized by classes of equivalency of their elements defined according to system specific rules. We propose a generalized preferential attachment model to describe the class size distribution. The model postulates preferential growth of the existing classes and the...

We present a preferential attachment growth model to obtain the distribution P(K) of number of units K in the classes which may represent business firms or other socio-economic entities. We found that P(K) is described in its central part by a power law with an exponent φ = 2+b/(1−b) which...

We introduce a model of proportional growth to explain the distribution P(g) of business firm growth rates. The model predicts that P(g) is Laplace in the central part and depicts an asymptotic power-law behavior in the tails with an exponent ζ = 3. Because of data limitations, previous studies...

It is claimed that introducing flexibility in regulation is a sufficient condition for curbing the level of informality in the developing world. This dissertation tries to test the validity of this claim using data for 46 countries over the time period 1980-2008 to explore the dynamics between...

An explosion of knowledge and a growing array of tools and technologies have transformed modern drug R&D, while its cost has risen by a sizable amount. At the same time, the unchecked increase in health care and prescription drug spending has spawned cost containment policies that are...

The paper examines the rationale behind the Government of India's decision to initiate the manufacture of penicillin through collaboration with specialized agencies of the United Nations. Initially the expectation had been that collaboration was essential with one of the prominent transnational...

Consumers often use an expected future price of a product as a reference for judging the current price, and consequently make purchase decisions such as whether to buy and how much to buy. Extant literature has acknowledged the use of an expected future price of a product in formation of price...