When the Melitz model is implemented in practice, the industrial productivity distribution is often assumed to be of Pareto form. In this case, a fundamental relationship κ > σ − 1must hold to guarantee the convergence of the industrial average productivity, where κ is the concentration degree of the industrial productivity Pareto distribution and σ is the substitution elasticity across varieti...

Social scientists have long noticed that firms engaged in the same business tend to be co-located with each other in a small number of separate places. This phenomenon was labeled as “economies of agglomeration” by Alfred Marshall (1920) in his neo-classical Principles of Economics. More recently, the term “industrial cluster” – defined as geographic concentrations of interconnected companies a...

There is currently scarce information on the occurrence and distributions of Polycyclic Aromatic Hydrocarbons (PAHs) in the air from industrial estates in Nigeria. Hence, the present study aims to evaluate the extent and sources of pollution of polycyclic aromatic hydrocarbons in the air from some industrial estates in Lagos and Ogun States, Nigeria. Ten air samples have been collected from the...

transport infrastructure is an important factorforthe spatialdistribution ofgoods, services andinnovationswithinand between regions, and also an important factorin locating andestablishingbusinessesinthe region. this research aims to analyze the effects of transportation infrustructure on industrial concentration in the iranian provinces. for this aim, we have specified econometrics models and ...

Fifty-seven typical surface soils and 108 deeper soils were collected from five former industrial sites in Beijing and concentrations of total Hg (SigmaHg) as well as pH, total carbon (TC), total nitrogen (TN), total sulfur, and dissolved organic carbon concentrations determined. The mean concentration of SigmaHg in surface soils was significantly greater than background concentrations in the v...

There is currently scarce information on the occurrence and distributions of Polycyclic Aromatic Hydrocarbons (PAHs) in the air from industrial estates in Nigeria. Hence, the present study aims to evaluate the extent and sources of pollution of polycyclic aromatic hydrocarbons in the air from some industrial estates in Lagos and Ogun States, Nigeria. Ten air samples have been collected from the...