Trade involves the transfer of goods or services from one person or entity to another, often in exchange for money. A system or network that allows trade is called a market.
The product of mental labor — science — always stands far below its value, because the labor-time necessary to reproduce it has no relation at all to the labor-time required for its original production.
Karl Marx Addenda, "Relative and Absolute Surplus Value" in Economic Manuscripts (1861–63).
Power generation from a renewable resource like wind directly depends on the weather, which cannot be easily predicted. An EU initiative improved wind power and electricity demand forecasting in order to make wind power more valuable on the power market.
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