供給が不安定な中、リサイクル・コンテンツ表示のメリットを分析した研究結果 Study analyzes the benefits of recycled content claims amid supply uncertainty
2023-04-03 バッファロー大学(UB)
ニューヨーク市が2030年までに廃棄物をゼロを目指すなど、地方自治体が環境に関する取り組みを進める中、バッファロー大学経営大学院の研究者らは、リサイクル素材の使用に関するコストと利益を最適化する新しいモデルを開発した。製造業者が後処理された内容物の供給と在庫コストを考慮した最適なリサイクル内容物の選択を見つけるための枠組みを提供する。
研究者たちは、リサイクル率が高く、データが豊富なヨーロッパのグラスウール生産に焦点を当て、市場ベースのインセンティブを見つけることが、埋立地が容量限界に達することを防ぐための重要な手段であると述べている。
＜関連情報＞
- https://www.buffalo.edu/news/news-releases.host.html/content/shared/mgt/news/how-to-optimize-recycled-content-products.detail.html
- https://www.sciencedirect.com/science/article/abs/pii/S0377221723000140
需要の便益と供給の不確実性の下でのリサイクル・コンテンツの主張： 多期間モデルおよびグラスウール断熱材への適用 Recycled content claims under demand benefit and supply uncertainty: Multi-period model and application to glasswool insulation
Ananth V. Iyer, Aditya Vedantam, Paul Lacourbe
European Journal of Operational Research Available online: 12 January 2023
DOI:https://doi.org/10.1016/j.ejor.2023.01.014
Abstract
Manufacturers often declare recycled content claims that are specific (e.g., to each production period) or average (e.g., across many production periods). Such claims are manifested through the choice of certification and generate demand for the manufacturer’s recycled content product. However, since the amount of usable recycled input available from local sources is often limited and uncertain, and external (non-local) sources are expensive, a manufacturer needs to balance the demand-side benefits of a recycled content claim with the associated sourcing and inventory costs. In this paper, we develop a multi-period model over a planning horizon, where a manufacturer makes a product’s source mix decision (recycled input vs. virgin content) and recycled input carryover decision each period in the presence of a stochastic supply and external sourcing cost. We solve for the manufacturer’s optimal recycled content claim decision over a planning horizon and calculate the manufacturer’s profit, recycled input, and virgin raw material usage at the optimal claim. Our key contributions are as follows. We show that (i) a shorter (longer) planning horizon may sometimes increase (decrease) the recycled content claim, (ii) demand stimulation for recycled products may sometimes decrease the optimal recycled content claim, and (iii) supply stabilization (i.e., lowering variability in the municipal stream) may decrease the recycled content claim. We provide numerical results for parameters driven by European data from the fiberglass insulation industry and use our analysis to quantify the impact of several European policies relevant to the glasswool insulation industry on a manufacturer’s incentive to incorporate recycled content.
