In this paper we study whether the commodity futures market predicts the commodity spot market. Using historical daily data on four commodities—oil, gold, platinum, and silver—we find that they do. We then show how investors can use this information on the futures market to devise trading strategies and make profits. In particular, dynamic trading strategies based on a mean–variance investor fr...

The attention on Radio Frequency Identification (RFID), Mobile Business and Mobile Content has recently attracted in various industry sectors, the media and in academic research. This article focuses on the convergence of RFID technologies and mobile devices and presents applications in the retail business. Based on related literature and existing models and technologies, a business framework a...

Peer-to-peer (P2P) has become a viable model for content exchange over the Internet in the last few years and consequently there is a need for a framework to incorporate payment services in this environment to enable paid content delivery via P2P systems; whereby individual content owners may be compensated for their work whilst at the same time keeping in sync with the inherent properties of a...

Single-electron tunneling devices can detect charges much smaller than the charge of an electron. This enables phenomenally precise charge measurements and it has been suggested that large scale integration of single-electron devices could be used to construct logic circuits with a high device packing density. Here the operation of the two basic types of single-electron tunneling transistors is...

The theory of tax competition suggests that different tools might be used to attract physical capital and taxable profits. While it is assumed that FDI in real activity is deterred by high effective taxes, investment undertaken for purpose of profit-shifting is deterred by a higher statutory tax rate. Using information from the RWI-Database "Globalisation", which contains statistics about forei...

This paper presents a two-period model to analyze the dynamic pricing behavior of two profit-maximizing firms that have equal inventories of perfectly substitutable and perishable products. Two versions of the problem are studied. In the first version, firms simultaneously announce their first period prices, observe the sales each makes, and then simultaneously announce their second period pric...

his, Mrs. Lorimer, who was ill. Dr. Stuart agreed and called on the following day. He was then told to consult with Dr. Brougham regarding the patient, and accordingly made an appointment with Dr. Brougham for tho following day, which that gentleman was unable to keep. Dr. Stuart paid his second visit, however, and on the third day, the 11th July, both he and Dr. Brougham held a consultation, s...

We elucidate some properties of the relation between two T-dual systems in tori, branes at angles and branes wrapping the whole torus carrying fluxes. We analyze different features of these systems: charges, low energy spectrum, tadpole cancellation, symmetry groups, ... and the correspondence between the two viewpoints. Particular attention is paid to supersymmetry and stability conditions. Wh...