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).
Keeping large jets in flight while traversing thousands of miles at high speed consumes quite a bit of fuel. Novel technology to reduce drag while reducing weight promises a significant reduction in fuel usage and associated costs and emissions.
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