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value, in economics

(Encyclopedia)value, in economics, worth of a commodity in terms of other commodities, or in terms of money (see price). Value depends on both desirability and scarcity. The marginal theory of value, pioneered in t...

Exeter Book

(Encyclopedia)Exeter Book, manuscript volume of Old English religious and secular poetry, of various dates of composition, compiled c.975 and given to Exeter Cathedral by Bishop Leofric (d. 1072). See edition by G...

Psalms

(Encyclopedia)Psalms sôlˈtər [key], book of the Bible, a collection of 150 hymnic pieces. Since the last centuries b.c., this book has been the chief hymnal of Jews, and subsequently, of Christians. The hymns ar...

meson

(Encyclopedia)meson mēˈzŏn [key] [Gr.,=middle (i.e., middleweight)], class of elementary particles whose masses are generally between those of the lepton class of lighter particles and those of the baryon class ...

David I, king of Scotland

(Encyclopedia)David I, 1084–1153, king of Scotland (1124–53), youngest son of Malcolm III and St. Margaret of Scotland. During the reign of his brother Alexander I, whom he succeeded, David was earl of Cumbria,...

David II, king of Scotland

(Encyclopedia)David II (David Bruce), 1324–71, king of Scotland (1329–71), son and successor of Robert I. David's guardians were not strong enough to prevent the invasion (1332) of Scotland by Edward de Baliol,...

David and Lucile Packard Foundation

(Encyclopedia)David and Lucile Packard Foundation, private philanthropic institution that funds nonprofit organizations. It was founded in 1964 by David Packard (1912–96), co-founder of Hewlett-Packard Co., and h...

Stuart, David, duke of Rothesay

(Encyclopedia)Stuart or Stewart, David, duke of Rothesay rŏthˈsē [key], 1378?–1402, Scottish prince; son and heir apparent of Robert III. On his father's accession (1390) to the throne, David became earl of Ca...

Thompson, Sir John Sparrow David

(Encyclopedia)Thompson, Sir John Sparrow David, 1844–94, Canadian political leader, b. Nova Scotia. He was elected (1877) to the provincial assembly, was briefly provincial prime minister, and then was made a jus...

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