Two traditional explanations for structural changes are sector-biased technological progress and non-homothetic preferences. This paper integrates both into an otherwise standard growth model and quantitatively evaluates them vis-a-vis time series. The exercise identifies a set of puzzles for standard theories: (i) the model cannot account for the steep decline in manufacturing and rise in serv...

linguistic theories have greatly influenced language teaching theories in whatever stage they have been. By reviewing the three main stages of linguistic theories that have existed until now in the history of linguistics, this article has generalized the language teaching theories and the classroom characters resulted

importance of security and sense of peace is a one of the most important factors of urban environment. therefore, the necessity of security in urban spaces has caused the emergence of authentic theories like defensible spaces and crime prevention through environment design (cpted)*. in this paper, various literatures related to defensible space theories have been reviewed and the related keywor...