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).
Scarcity of fresh water is of growing concern in the Mediterranean area due to urbanisation, irrigation and changing rainfall patterns. The influx of millions of Sun-seeking tourists puts even more pressure on limited water resources during the summer season.
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