Harry Markowitz established the foundation of modern portfolio theory in 1952. The CAPM was developed twelve years later in articles by William Sharpe, John Lintner, and Jan Mossin.
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He developed the "scratching" technique.
The electric guitar was was developed during the 1930s by the Rickenbacker Internation Coroporation.
What Mesopotamian land developed the first complex society?
dynamic
In Aberdeen Washington