飼育面積に厳しい制約がある中小の畜産業における財政状況は,通常,支配的な買い手の注文数量と提示価格に依存している.本研究では,支配的な買い手の需要を満たすための家畜(製品1)を生産するだけでなく,他の顧客向けに,ブランド牛や銘柄鶏のような独自ブランド(製品2)を導入する場合を考える.この上で,畜産業の単位時価当たり総利益を定式化し,これを最大にするという意味での最適販売価格の存在条件を明らかにする.また,単位時間当たり総利益が有する多数の(22個の)パラメータの推定方法についても提案する.さらに,数値例により提案するモデルの特徴について考察し,製品2の価格弾力性が,製品1のそれと同等,またはそれ以下の場合には,製品2を導入することにより,利益を大きくできる場合が存在することを示す.The financial situation of small and medium-sized livestock businesses, which are subject to strict constraints on the available area for rearing, usually depends on the order quantities and prices offered by the dominant buyer. In this study, we consider a scenario where, in addition to producing livestock( Product 1) to meet the demand of the dominant buyer, the livestock farmer introduces their own brand (Product 2), such as branded chicken, for other customers. We then formulate the total profit of the livestock farmer and clarify the conditions for the existence of the unique optimal pair of selling prices to maximize this profit. Methods for estimating the 22 parameters included in the total profit per unit of time are also proposed. Furthermore, the properties of the proposed model are discussed using numerical examples, demonstrating that there are cases where the profit can be increased by introducing Product 2 if the price elasticity of Product 2 is equal to or lower than that of Product 1.1departmental bulletin pape
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