Threshold estimation for continuous three-phase polynomial regression models with constant mean in the middle regime

This paper considers a continuous three-phase polynomial regression model with two threshold points for dependent data with heteroscedasticity. We assume the model is polynomial of order zero in the middle regime, and is polynomial of higher orders elsewhere. We denote this model by ${ℳ}_2$, which includes models with one or no threshold points, denoted by ${ℳ}_1$ and ${ℳ}_0$, respectively, as special cases. We provide an ordered iterative least squares (OiLS) method when estimating ${ℳ}_2$ and establish the consistency of the OiLS estimators under mild conditions. When the underlying model is ${ℳ}_1$ and is $(d_0-1)$th-order differentiable but not $d_0$th-order differentiable at the threshold point, we further show the $O_p(N^{-1/(d_0+2)})$ convergence rate of the OiLS estimators, which can be faster than the $O_p(N^{-1/(2d_0)})$ convergence rate given in Feder when $d_0\ge 3$. We also apply a model-selection procedure for selecting ${ℳ}_{\kappa }$; $\kappa =0,1,2$. When the underlying model exists, we establish the selection consistency under the aforementioned conditions. Finally, we conduct simulation experiments to demonstrate the finite-sample performance of our asymptotic results.     

营销能力理论流派研究

营销能力是决定企业命运和竞争的关键。在细读了大量国内外文献的基础上,研究营销能力理论的发展过程,对流程营销能力流派、资源营销能力流派、企业营销能力流派的基本情况进行比较,述评三大流派的主要观点,并总结出营销能力理论流派的特点。     

Influence of endogenous reference points on the selling decisions of retail investors

Using trader-level data, we examine the impact of the stock-specific endogenous reference points, the ‘realized-return’ and the ‘peak-return’ of the prior round on the selling propensity in a subsequent investment round in the same asset. The selling propensity rises significantly near the endogenous reference points. The significance is greater when the holding period is relatively shorter and when the time gap between the consecutive rounds is lower, implying a recency effect. Finally, the impact is more substantial on traders holding fewer stocks. The results imply that traders' prior stock-specific experience plays a significant role in the reference point formation.     

Branch network structure,authority and lending behaviour

Using a novel dataset of Ukrainian banks, this paper examines the link between the structure of branch network and bank lending. Bank regional branches are categorised into contact points without loan decision-making authority and more independent delegated branches which can make loan decisions. We find that a large and dispersed network of contact points can help increase credit supply and mitigate risks through diversification. Further, banks benefit from the information advantage brought by the presence of delegated branches in local markets. However, the longer distance between headquarters and local delegated branches, the more amplified agency problems become, which outweighs the benefits. Our findings suggest that the optimal structure could be a centralised network of delegated branches combined with a diversified access point network.