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Avoiding future stock market crashes: 'Diversification effect' that protects portfolio of shares disappears during general slump

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New research reveals that the 'diversification effect' that protects a portfolio of shares through the vagaries of the stock market disappears when there is a general slump in the market. (Credit: © jamdesign / Fotolia)

TechAndComputer (Oct. 18, 2012) — A 72-year study of the Dow Jones could help avoid the kind of stock market crash that struck the world economy in 2008.

Professor Tobias Preis has led a study of the second oldest US market index and discovered that a portfolio of shares, far from being diverse and spreading risk during a time of stock market slump, start behaving the same.

This new study has been carried out in collaboration with Dr. Dror Y. Kenett (Boston University, USA)...

A little science goes a long way: Engaging kids improves math, language scores

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TechAndComputer (Oct. 18, 2012) — A Washington State University researcher has found that engaging elementary school students in science for as little as 10 hours a year can lead to improved test scores in math and language arts.

Samantha Gizerian, a clinical assistant professor in WSU's Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology, saw improved test scores among fourth-grade students in South Los Angeles after students from the Charles R. Drew...

Nobel Prize in Economics 2012: Stable allocations -- from theory to pratice

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TechAndComputer (Oct. 15, 2012) — The Royal Swedish Academy of Sciences has decided to award The Sveriges Riksbank Prize in Economic Sciences in Memory of Alfred Nobel for 2012 to Alvin E. Roth, of Harvard University and Harvard Business School, and Lloyd S. Shapley, of the University of California, Los Angeles, "for the theory of stable allocations and the practice of market design."

This year's Prize concerns a central economic problem: how to match different agents as well as...

Beliefs drive investors more than preferences

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TechAndComputer (Aug. 28, 2012) — If experts thought they knew anything about individual investors, it was this: their emotions lead them to sell winning stocks too soon and hold on to losers too long.

But new research casts doubt on this widely held theory that individual investors' decisions are driven mainly by their feelings toward losses and gains. In an innovative study, researchers found evidence that individual investors' decisions are primarily motivated by their beliefs...

Mathematicians develop new method for describing extremely complicated shapes

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TechAndComputer (July 30, 2012) — Mathematicians at the Institute for Advanced Study in New Jersey "bridged" topology and fractals and made a discovery that could lead to a new way of describing extremely complicated shapes such as the configuration of the tiniest defects in a metal or even the froth of a breaking wave.

Topology is a powerful branch of mathematics that looks at qualitative geometric properties such as the number of holes a geometric shape contains, while fractals are...