We present a theory of entrepreneurial entry and exit decisions. Knowing their own managerial talent, entrepreneurs decide which market to enter, where markets differ in size. We obtain a striking sorting result: each entrant in a large market is more efficient than any entrepreneur in a smaller market. The result obtains since competition is endogenously more intense in larger markets. The sor...

Donghui Xie , Peijuan Wang 2 and Qijiang Zhu 1 (1) State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Beijing Normal University and the Institute of Remote Sensing Applications, CAS.; Beijing Key Laboratory for Remote Sensing of Environment and Digital Cities, Beijing Normal University; School of Geography and Remote Sensing Science, Beijing Normal University; 100875 (2) Chine...

the main purpose of this research was to investigate farmer’s attitude towards privatization of agricultural extension in shirgah district , mazandaran province. the statistical population consisted of 15300 farmers who inhabited as residents in 54 villages. using stratified proportional random sampling, 150 farmers (through cochran formula) were selected. the study revealed that 84% of farmers...

The paper briefly reviews Duncan Dowson's ground-breaking contribution to the theory of elastohydrodynamic lubrication in relation understanding gear tooth contacts. His early work with Higginson on numerical modelling finally explained how gears can operate successfully, and avoid wear, due generation a stiff, protective oil film. resulting minimum film thickness equation stands as reliable re...

As new products are generally difficult to be accepted by consumers, and the cost of initial market introduction is high, enterprises often choose to do market extension of an existing brand. Simultaneously, a successful brand extension can enhance the reputation of the original brand, and expand the brand value. But how can enterprise take a good brand extension? Through establishment of a dyn...

This paper gives the concepts of extension error set and fuzzy extension error set, discusses diverse extension error set and fuzzy extension error set based on extension set and error set, and puts forward the relevant propositions and operations. Finally, it provides proofs of the soundness and completeness for the propositions and operations.

The interaction of automatic semigroups and Bruck–Reilly extensions is studied. It is proved that every automatic Bruck–Reilly extension has an automatic base semigroup. This result is then applied to answer negatively the question of Andrade et al. on whether automatic structures for Bruck–Reilly extensions of groups are characterized by the fellow traveller property. An example is exhibited t...

The Internet gives individuals more choice in political news and information sources and more tools to filter out disagreeable information. Citing the preference described by selective exposure theory — people prefer information that supports their beliefs and avoid counter-attitudinal information — observers warn that people may use these tools to access only agreeable information and thus liv...

The aim of this study was to examine the relationship between temperament, ruminative thought style and social anxiety using latent variable modeling. Before examining integrated model that specifies relations constructs, relevant measurement issues were examined. conducted on a heterogeneous sample from general population included 1,029 participants (62.1% female) aged 19 79. findings show Beh...

Prior research into military–civilian transition has suggested that the Prison Service may be a popular destination for Armed Forces leavers, but experience of former military personnel within prison system as staff (rather than Veterans in Custody) so far been overlooked. As result, we know very little about their route work. This article reports on UK study investigating who have previously s...