For a commodity chemical company like Copano, plant value is often driven by changes in a single key variable, such as the spread between the price of the output commodity chemical (polyethylene terephthalic acid, or PTA, for example) and the cost of a key input commodity chemical (p-xylene, say).
In addition to volatile currency fluctuations, input commodity costs have been steadily rising since March.
The nominal quantity of input commodity i is x i, and the quality measure (i.e., the MRS of the input commodity with respect to the standard) is λ i.
Three social-ecological domains were identified across the eight landscapes (Tropical Agriculture-Forest Matrix, Tropical Degrading Agroecosystem, and Temperate High-Input Commodity Agriculture) using hierarchical clustering of the indicator values.
The system contains regularly updated statistical data on land use, agricultural productions, exports and imports of agricultural products, agricultural inputs, commodity prices, farm machineries, and development infrastructures.
The role of medicines is narrowed down to a system input, a commodity that should be available to allow service delivery.
These examples show that many policy barriers continue to inhibit the development of competitive input and commodity markets.
Moving from the general statements to the specificity of agriculture, macro-economic policies in agriculture have been directed towards the liberalization of the agricultural sector and the privatization of the public agricultural schemes and of trade in agricultural inputs and commodities.
The first row shows a process which produces a commodity for input use (the first commodity).
The total input requirements of commodity i for making commodity j (as a single product) are thus: u i j − ∑ k = 1 k ≠ j n a i j k v j k + ∑ k = 1 k ≠ j n a i k j v k j, where a ijk is the amount of commodity i used by industry j for making a unit of commodity k.
