über die Wirkung der Optionsbündelung auf die Ablaufplanung einer Variantenflie?fertigung

Zusammenfassung Bei der Optionsbündelung werden einzelne Ausstattungsmerkmale (Optionen) zu Paketen (Bündeln) zusammengefasst, so dass der Kunde, von einem Grundmodell ausgehend, durch die Auswahl unterschiedlicher Optionsbündel eine bestimmte Produktvariante konfigurieren kann. Im Mittelpunkt dieses Beitrags steht die Beantwortung der Frage, ob eine solche Optionsbündelung den Produktionsablauf positiv beeinflusst. Dabei richtet sich das Augenmerk auf die Produktionsform der Variantenflie?fertigung, die in der Endmontage variantenreicher Endprodukte (etwa in der Automobilindustrie) eine dominierende Stellung einnimmt. Eine umfangreiche computergestützte Evaluierung verdeutlicht einerseits den generell positiven Einfluss der Optionsbündelung und identifiziert andererseits im Rahmen der Betrachtung unterschiedlicher Bündelungsarten die kumulative Bündelung als besonders geeignet.      

The Impact of Investment Constraints on Portfolio Performance Measurement: The Power Utility Function Case

This paper examines the effect of investment constraints on performance measurement of institutionally managed funds. Assuming that these funds have a power utility function and using an optimal portfolio choice model, one can show that the Security Market Line remains a valid benchmark for these constrained funds under the perfect market assumption. Relaxing the perfect market assumption, one can prove that a non-stationary constrained investment policy will bias traditional measures of timing ability differently across managers types. Finally, the magnitude of this bias is illustrated with a numerical example.     

The grain trade in northern Europe before 1350

A network of interregional grain routes extended across northern Europe in the century before 1350. With an interlude from c . 1310 to 1330 English grain was shipped to western Norway and the last decades before 1350 witnessed increasing English deliveries to the Netherlands. The most important of these commercial links were the grain routes from Mecklenburg, Pomerania, and Prussia to Norway, England, and the Netherlands established on a regular basis c . 1300. In western Europe the Baltic grain deliveries were an alternative source of supply which affected prices, urbanization, and the profitability of arable farming.     

Gains From Diversifying Into Real Estate: Three Decades of Portfolio Returns Based on the Dynamic Investment Model

This paper compares the investment policies and returns for portfolios of stocks and bonds with and without up to three categories of real estate. Both domestic and global settings are examined, with and without the possibility of leverage. The portfolios were generated via the dynamic investment model based on the empirical probability assessment approach applied to past (joint) realizations of returns, both with and without correction for "smoothing" in the real estate data series. Our principal findings are: (1) the gains from adding real estate, on a semi-passive (equal-weighted) basis, to portfolios of either U.S. or global financial assets were relatively modest; in contrast, (2) the gains from adding real estate to the universe of U.S. financial assets under an active strategy were rather large (in some cases highly statistically significant), especially for the very risk-averse strategies; (3) the gains from adding U.S. real estate to a universe of global financial assets under an active strategy were mixed, although generally favorable for the highly risk-averse strategies; (4) correcting for second-moment smoothing in the real estate returns series had a relatively small impact for the more risk-tolerant strategies; and (5) there was some evidence that desmoothing resulted in improved probability estimates.     

Prices vs. Quantities: The Irrelevance of Irreversibility*

We explore the efficacy of price and quantity controls in a dynamic setup in which the decisions of some agents are irreversible. The assumption of irreversibility is shown to improve the performance of a tax relative to that of a system of tradable quotas and significantly alter the equilibrium behavior of agents. We nevertheless conclude that taking into account the fact that agents’ decisions may be irreversible does not lead to policy implications significantly different from those reached in a simpler model in which irreversibility is ignored.