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Ralf Seifert

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Publications associées (58)

A test of inventory models with permissible delay in payment

Ralf Seifert, Daniel Seifert, Olov Isaksson

Contrary to the long-standing view in the finance literature that firms should maximise payment delays, research in operations management suggests that long payment delays can be suboptimal. In this study, we reconcile these two views by applying a seconda ...

2017

Building up Resilience in a Pharmaceutical Supply Chain through Inventory, Dual Sourcing and Agility Capacity

Ralf Seifert, Florian Christopher Matthias Lücker

This paper is inspired by a risk management problem faced by a leading pharmaceutical company. Key operational risk mitigation measures include Risk Mitigation Inventory (RMI), Dual Sourcing and Agility Capacity. We study the relationship between these thr ...

2017

How Process Industries Can Improve Supply Chain Performance

Ralf Seifert, Philipp Urs Moser, Olov Isaksson

2017

Dynamic Product Portfolio Management with Life Cycle Considerations

Ralf Seifert, Jean-Sébastien Tancrez, Isik Bicer

We consider a portfolio of products in which each product probabilistically transitions through various life cycle stages. The evolution through these life cycle stages is impacted by both marketing support and product launch decisions, which are bound by ...

2016

Quantifying the Bullwhip Effect Using Two-Echelon Data: A Cross-Industry Empirical Investigation

Ralf Seifert, Olov Isaksson

The bullwhip effect denotes the phenomenon whereby demand variability is amplified from a downstream site (buyer) to an upstream site (supplier) in the supply chain. This paper contributes to the literature that empirically investigates the bullwhip effect ...

Elsevier2016

Carbon footprint and responsiveness trade-offs in supply chain network design

Ralf Seifert, Joana Maria Comas Marti, Jean-Sébastien Tancrez

Concern related to sustainability and greenhouse gases has grown among citizens as well as firms, which are increasingly committing to carbon emission reduction targets. However, firms' emissions come from direct and indirect sources, and from the differen ...

2015

On the optimal frequency of multiple generation product introductions

Ralf Seifert, Shuangqing Liao

This paper considers a firm that introduces multiple generations of a product to the market at regular intervals. We assume that the firm has only a single production generation in the market at any time. To maximize the total profit within a given plannin ...

2015

Coherent Measures of Customer Service Level

Ralf Seifert, Isik Bicer

2015

Knowledge Spillovers in the Supply Chain: Evidence From The High Tech Sectors

Ralf Seifert, Olov Isaksson

2015

The value of updated information on future price behaviour

Ralf Seifert, Shuangqing Liao

This paper studies the value of information on future price behaviour. We consider a one-period inventory modelling framework with random period length and two order opportunities. The selling price is determined dynamically and the demand is price-sensiti ...

Taylor & Francis Ltd2014

Inventory Leanness and the Financial Performance of the Firm

Ralf Seifert, Olov Isaksson

This paper examines the financial consequences that inventory leanness has on firm performance. We conduct an econometric analysis using 4324 publicly traded US manufacturing companies for the period 1980-2008. Using an instrumental variable fixed effects ...

2014

Joint product assortment, inventory and price optimization to attract loyal and non-loyal customers

Ralf Seifert, Argyro Katsifou, Jean-Sébastien Tancrez

In this paper, we analyze the emerging retail practice of carrying a combined product assortment consisting of both regular "standard" products and more fashionable and short-lived "special" products. The purpose of this practice is to increase store traff ...

Pergamon-Elsevier Science Ltd2014

Trade Credit: Literature Review and Research Directions

Ralf Seifert, Margarita Protopappa, Daniel Seifert

Trade credit arises when a buyer delays payment for purchased goods or services. Its nature has predominantly been an area of inquiry for researchers from the disciplines of finance, marketing, and economics but it has received relatively little attention ...

Elsevier2013

Lego: Consolidating Distribution (Abridged)

Ralf Seifert

2013

Financial Supply Chain Management: Working Capital Requirements with Short-term Debt

Ralf Seifert, Margarita Protopappa, Cristopher Ariel Zeballos Avila

In this paper, we build on a single product, finite horizon, periodic review inventory management setting and include key financial aspects such as working capital constraints, payment delays and multiple sources of financing. We numerically solve for the ...

2013

Assessing the Comprehensiveness of Supply Chain Environmental Strategies

Ralf Seifert, Joana Maria Comas Marti

As environmental awareness grows, firms are expected to expand the scope of their environmental strategies beyond organisational boundaries and to address more comprehensively environmental issues in their supply chains and product life cycles. Drawing on ...

Wiley-Blackwell2013

The Perks and Pitfalls of Knowledge Diffusion in the Supply Chain

Ralf Seifert, Olov Isaksson

2013

A three-echelon supply chain with price-only contracts and sub-supply chain coordination

Ralf Seifert, Shuangqing Liao

This paper studies coordination in a three-echelon supply chain and examines the impact of sub-supply chain coordination (sub-coordination). Our analysis is based on the price-only contracts that are commonly used in practice. The model is of the newsvendo ...

2012

Benefits and Scepticism of Ecolabels as Accountability Mechanism

Ralf Seifert, Joana Maria Comas Marti

Environmental labelling is an accountability mechanism for firms to satisfy growing demands to prove that value chains are sustainably managed. Although the large variety of ecolabels available today can be interpreted as a sign of their success, it is ove ...

Emerald2012

Designing Service Level Contracts for Supply Chain Coordination

Ralf Seifert

Supply contracts are used to coordinate the activities of the supply chain partners. In many industries, service level-based supply contracts are commonly used. Under such a contract, a company agrees to achieve a certain service level and to pay a financi ...

2012

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