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).
The deterioration of historic buildings has become an increasingly urgent issue and consequently the need of a more sustainable management of the built heritage as well. An EU initiative has developed complex new materials designed specifically to restore heritage materials.
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