Abstract
Significant advances in trading technology, information sources and financial products have not improved our ability to explain significant price moves in the overall US stock market, according to research by <b>Bradford Cornell</b>, Visiting Professor of Financial Economics at the <b>California Institute of Technology</b>. This Practical Applications report outlines his findings, which were published in the Spring 2013 issue of <b><i>The Journal of Portfolio Management</i></b> in <b><i>What Moves Stock Prices: Another Look</i></b>. “This paper is highlighting a question, one that readers should understand… rather than offering a solution,” he explains. In this report, however, Cornell details the most cost-effective way to protect a portfolio against this new paradigm. Large US stock market movements remain as common and mysterious as ever, Cornell maintains. He studied the largest daily stock market moves from 1988 to 2012 to update and extend a widely read article on the same topic from 1946–1989 [Cutler et al., JPM, Spring 1989)].
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