The physics of financial markets is an emerging science. In the second part of a guide to this new field, one of its exponents, Yi-Cheng Zhang of Fribourg University, outlines the theory behind some of his own models of the market-place A new trend has arisen recently: more and more physicists have been attracted to economy-related problems. Evidence of this is the growth in the numbers of papers in physics journals devoted to theoretical and applied issues in economics and finance. In addition, fresh PhDs and seasoned researchers alike are finding careers in finance, new journals are being launched and conferences organized. Trespassing on the domain of others is a notorious activity of physicists: their insatiable curiosity steadily pushes them into their near and far neighbours' territories such as biology, economics and other natural and social disciplines.
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