This paper considers two multi-item auction formats (ascending and sealed bid) which both identify the minimum Walrasian equilibrium prices and where truthful preference revelation constitutes an equilibrium. Even though these auction formats share many theoretical properties, there are behavioral aspects that are not easily captured. To explore this issue in more detail, this paper experimentally investigates what role the design of the auction format has for its outcome. The results suggest that the sealed bid mechanism performs weakly better in all of the investigated measures (consistent reporting, efficiency etc.). In addition, we find that the performance of the ascending auction is increasing over time, whereas the sealed bid auction shows no such tendency.

This paper analyzes the problem of selecting a set of items whose prices are to be updated in the next iteration in so called simple ascending auctions with unit-demand bidders. A family of sets called “sets in excess demand” is introduced, and the main result demonstrates that a simple ascending auction always terminates at the minimum Walrasian equilibrium prices if and only if the selection belongs to this family.

Nordic co-operationNordic co-operation is one of the world's most extensive forms of regional collaboration, involving Denmark, Finland, Iceland, Norway, Sweden, and the Faroe Islands, Greenland, and Åland

This paper investigates hypotheses related to efficiency and price uniformity in online competing auctions based on two theoretical predictions from Peters and Severinov [Peters, M., Severinov, S., 2006. Internet auctions with many traders. Journal of Economic Theory 130, 220-245]. The investigation is conducted using a large and ideal data set for online competing train ticket auctions, and the findings support the theoretical predictions in large parts. (C) 2012 Elsevier B.V. All rights reserved.

OBJECTIVE:To measure serum concentrations of progesterone, estradiol and 5α- and 5β-reduced progesterone metabolites in the follicular and luteal phases of the menstrual cycle in women with latent acute intermittent porphyria and manifest acute intermittent porphyria in comparison with healthy control women. DESIGN:A descriptive study with repeated measurements during a complete, ovulatory menstrual cycle. SETTING:University hospital out-patient clinic. POPULATION:Thirty-two women with DNA-diagnosed acute intermittent porphyria and 20 healthy control women. METHODS:Blood samples for serum progesterone, estradiol, allopregnanolone and pregnanolone were drawn on predefined menstrual cycle days, twice in the follicular phase and three times in the luteal phase. Serum levels of estradiol and progesterone were analysed with commercial kits. Allopregnanolone and pregnanolone levels were analysed with radioimmunoassay following diethylether extraction and celite column chromatography. MAIN OUTCOME MEASURES:Changes in serum levels of progesterone, estradiol, allopregnanolone and pregnanolone throughout the menstrual cycle. RESULTS:Women with acute intermittent porphyria displayed lower serum concentrations of allopregnanolone in comparison with healthy control women, the difference being most prominent in the luteal phase (p < 0.001). Levels of pregnanolone did not differ significantly between groups. No significant difference was found between women with latent acute intermittent porphyria and manifest acute intermittent porphyria. CONCLUSIONS:Decreased levels of the 5α-reduced progesterone metabolite allopregnanolone were found in the menstrual cycle of women with acute intermittent porphyria. This has not been reported previously and could indicate a reduced 5α-reductase type 1 capacity in the ovary and liver among these women.

Spisesvampe er blevet indsamlet og dyrket i mange ar, og interessen i de nordiske lande er vokset i de seneste artier. Formalet med publikationen er at give vaerktojer til brug i virksomhedernes ege ...

Arum saman hafa aetisveppir verið raektaðir og tindir villtir og ahugi a neyslu þeirra hefur aukist a Norðurlondunum a siðari aratugum. Markmið þessarar skýrslu að leggja til hjalpartaeki við að koma ...

This paper investigates algorithmic properties and overall performance of the exact auction algorithm in Demange, Gale and Sotomayor (J. Polit. Economy 94: 863–872, 1986) or DGS for short. This task is achieved by interpreting DGS as a graph and by conducting a large number of computer simulations. The crucial step in DGS is when the auctioneer selects a so-called minimal overdemanded set of items because the specific selection may affect a number of performance measures such as the number of iterations and the ratio of elicited preferences. The computational results show that (i) DGS graphs are typically large even for relatively small numbers of bidders and items, (ii) DGS converges slowly and (iii) DGS performs well in terms of preference elicitation. The paper also demonstrates that the modification to DGS based on the Ford–Fulkerson algorithm outperforms all investigated rules for selecting a minimal overdemanded set of items in DGS both in terms of termination speed and preference elicitation.

Mushrooms recognised as edible have been collected and cultivated for many years. In the Nordic countries, the interest for eating mushrooms has increased. In order to ensure that Nordic consumers ...