Order lot sizing with multiple capacitated suppliers offering leadtime-dependent capacity reservation and unit price discounts

2008 ◽  
Vol 19 (2) ◽  
pp. 142-149 ◽  
Author(s):  
E. Hassini
Author(s):  
Manoj Kumar ◽  
Jyoti Raman ◽  
Priya Singh

The main objective of this chapter is to deal with a single item lot sizing problem with fuzzy parameters, which is called the fuzzy single item lot sizing problem (F-SILSP). Since F-SILSP does not meet the crisp deterministic assumption, it cannot be solved by traditional mathematical programming. In this chapter, the possibility approach is chosen to convert the fuzzy model to be an equivalent crisp single item lot sizing problem (EC-SILSP). The equivalent crisp model from this transformation procedure is in the form of mixed integer linear programming (MILP). It can be solved by traditional solver to find an optimal solution for each pre-specified possibility level. A numerical example with both trapezoidal and triangular fuzzy parameters is illustrated to demonstrate that an equivalent crisp model can be used. In addition, the equivalent crisp model is employed in inventory planning in a case study of inventory planning for bituminous coal with trapezoidal fuzzy demand and triangular fuzzy unit price in a power plant of an example petrochemical company (Supreme Petro, India).


2017 ◽  
Vol 26 (7) ◽  
pp. 734-749 ◽  
Author(s):  
Lan Xia ◽  
Nada Nasr Bechwati

Purpose This paper aims to present a model linking price promotions to checkout donations. It is argued that price promotions evoke two perceptions/emotions, namely, feelings of gratitude and perceived sacrifice of purchase, which consequently, influence the likelihood to donate. Feelings of gratitude dominate when the discount is high, while feelings of sacrifice dominate when the discount is low. Compared to no-discount situations, high discounts enhance consumers’ intention to donate while low discounts reduce this intention. Design/methodology/approach A total of four studies using shopping scenarios are conducted. Study 1 examines the main effect and the mediating factors. Study 2 replicates the findings in different product categories and at different unit-price levels. Studies 3 and 4 test the moderating effects of customer effort and discount framing. Findings Findings of the four studies provide support for the proposed model. Compared to no-discount situations, high discounts enhance consumers’ intention to donate, while low discounts reduce this intention. The effects are mediated by feelings of gratitude and sacrifice and moderated by effort obtaining the discount and format of the discount. Research limitations/implications Theoretically, this research advances the understanding of consumers’ interpretations of price promotions. All studies are conducted in an online context. Practical implications This research informs retailers and charity institutions on the best timing for soliciting checkout donations and indicates specific tactics to enhance consumers’ donations. Originality/value This is the first study linking price discounts to the growing phenomenon of checkout donations. The research is different from cause marketing where the donation is included in the price of a specific product. The work also differs from studies examining the spillover effect where additional purchases benefit the consumers instead of a cause.


2017 ◽  
Vol 8 (2) ◽  
Author(s):  
Paul C Langley

In April 2017, the Institute for Clinical and Economic Review (ICER) issued its evidence report on the value of targeted immune modulators (TIMs) in rheumatoid arthritis. The report made the case that for the TIMs to be accepted for formulary placement in the US, where notional willingness-to-pay thresholds are the ICER gateway criteria, manufacturers should be prepared to offer substantial unit price discounts. The purpose of this commentary is to make the case that the methodology underpinning the ICER claims for value assessment does not meet the required standards of normal science. None of the claims made for clinical and comparative cost-effectiveness are credible, evaluable and replicable. As such, formulary committees have no idea whether ICER recommendations are right or even if they are wrong. They are, in fact, immune to failure and should be rejected. Utilizing ICER claims generated by simulated projections, this review points out that it is entirely possible to justify the current WAC or net pricing structure of TIMS. The review concludes that if ICER is to contribute to the successful formulary placement of drugs and devices the methodology for pricing recommendation should be re-assessed. As it stands, questions must be raised regarding recommendations for, possibly unnecessary, price discounts. ICER needs to develop an assessment framework that focuses on developing claims for competing therapies that are robust, evaluable and replicable together with recommendations on how these claims are to be evaluated in a timeframe meaningful to health care decision makers.   Type: Commentary


2013 ◽  
Vol 41 (6) ◽  
pp. 670-674 ◽  
Author(s):  
Chung-Yee Lee ◽  
Xi Li

Sign in / Sign up

Export Citation Format

Share Document