Development of an inclined plate jet reactor system

A new design combines reaction or extraction and separation in one unit. Here are practical working details.     

Improving retirement adequacy through asset class prioritization

Highly risk-averse retirees are generally advised to adopt a fixed spending strategy such as the 4% withdrawal rule. To prevent the premature depletion of a retirement portfolio, the rule attempts to proxy as the ‘safe withdrawal rate’. But a constant withdrawal rate means that retirees accumulate unspent surpluses when markets outperform and face spending shortfalls when markets underperform. While a safe withdrawal rate can prevent spending shortfalls, the opportunity cost of unspent surpluses associated with this strategy can be extreme. We apply a range of basic investment decision rules to a retirement portfolio applying various withdrawal rates and examine the probability of shortfalls over a retirement horizon. Using a block bootstrap simulation technique, we examine decision rules relating to stock and bond investments. Our results show that retirement portfolios with a bias towards stocks coupled with a decision rule that sources withdrawals from bonds and cash before stocks significantly outperforms alternative withdrawal strategies, despite the inherent increase in volatility. This finding is in direct contrast to the safe withdrawal rate conventions used in contemporary financial advice models.     

Issues in the relationship between theory and practice in management accounting

In recent decades the interest of academic researchers in the practical aspects of management accounting has waned. This editorial explores some of the reasons of this development. Over the past few decades we have witnessed the establishment of management accounting in academia as a social science. This has increased the credibility of the accounting academics. However, it has also meant that academic researchers have neglected the technical core of their discipline and its problems and issues which have a direct practical relevance. It is concluded that there is a need for academic researchers to have a stronger focus on the technical core of the subject and to harness the findings of empirical research so that they can be used to develop and support practice.     

Selling Versus Leasing of Durable Goods: The Impact on Marketing Channels

While many durable products are sold through intermediaries, there is limited understanding of how channel performance is influenced by transactions involving durable goods in a competitive market. In particular, extant research shows that intermediaries can significantly impact the leasing versus selling policy of a monopolistic manufacturer. This article seeks to fill that gap by examining the selling versus leasing choice of duopolistic manufacturers in the context of decentralized channels. Our analysis demonstrates that in addition to the unique equilibrium of selling, a prisoner's dilemma may arise where both manufacturers are better off if they were to lease their products.     

Testing Alternative Hypotheses in Economic History

This paper employs a statistical technique comparing non-nested quantitative models in order to address an important problem in economic history, namely, the appropriate role of microeconomic models in historical analysis. Discussion proceeds by example. As described in the paper, three research groups have offered explantations of the shift from corn to cotton production in the post-bellum US South but because their research methods are different, it is difficult to evaluate them effectively. This paper suggests a method for comparing them. The method is based on the Neyman–Pearson likelihood ratio and proceeds by focusing on the three groups’ models of crop choice, in turn hypothesizing each model as ‘truth’, and testing all other against it. Though restrictive in its own right, this excercise suggests one data-oriented approach to all-too-common problem of model proliferation in economic history.     

CEO duality,succession-planning and agency theory: research agenda

In response to Harris and Helfat's commentary on our article, ‘One hat too many: Key executive plurality and shareholder wealth,’ we suggest that their arguments are quite plausible, but we believe further empirical tests are needed. These proposed tests are described in our response. © 1998 John Wiley & Sons, Ltd.