<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7426</journal-id>
<journal-title><![CDATA[Revista Colombiana de Matemáticas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.colomb.mat.]]></abbrev-journal-title>
<issn>0034-7426</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia y Sociedad Colombiana de Matemáticas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74262007000300007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Telegraph models of financial markets]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[RATANOV]]></surname>
<given-names><![CDATA[NIKITA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Rosario Facultad de Economía ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>29</day>
<month>10</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>29</day>
<month>10</month>
<year>2007</year>
</pub-date>
<volume>41</volume>
<fpage>247</fpage>
<lpage>252</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74262007000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74262007000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74262007000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In this paper we develop a financial market model based on continuous time random motions with alternating constant velocities and with jumps occurring when the velocity switches. If jump directions are in the certain correspondence with the velocity directions of the underlying random motion with respect to the interest rate, the model is free of arbitrage and complete. Memory effects of this model are discussed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En este artículo introducimos un modelo de mercado financiero basado en movimientos aleatorios con la alternancia de velocidades y con saltos que ocurren cuando la velocidad se cambia. Este modelo es libre del arbitraje si las direcciones de saltos están en cierta correspondencia con las direcciones de velocidades del movimiento subyacente. Suponemos que la tasa de interés depende del estado de mercado. Las estrategias reproducibles para opciones son construidas en detalles. Se obtienen las fórmulas de forma cerrada para los precios de opción.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Jump telegraph process]]></kwd>
<kwd lng="en"><![CDATA[european option pricing]]></kwd>
<kwd lng="en"><![CDATA[perfect hedging]]></kwd>
<kwd lng="en"><![CDATA[self-financing strategy]]></kwd>
<kwd lng="en"><![CDATA[fundamental equation]]></kwd>
<kwd lng="en"><![CDATA[historical volatility]]></kwd>
<kwd lng="es"><![CDATA[Procesos salto de telégrafo]]></kwd>
<kwd lng="es"><![CDATA[opción europea de valoración,]]></kwd>
<kwd lng="es"><![CDATA[protección total]]></kwd>
<kwd lng="es"><![CDATA[estrategia de auto financiación]]></kwd>
<kwd lng="es"><![CDATA[ecuación fundamental]]></kwd>
<kwd lng="es"><![CDATA[volatilidad histórica]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <font face="verdana" size="2">      <p><b><font size="4">    <center>Telegraph models of financial markets</center></font></b></p>      <center>NIKITA RATANOV<sup>1</sup></center>    <br>  <sup>1</sup> Facultad de Econom&iacute;a, Universidad del Rosario, Bogot&aacute;, Colombia. E-mail: <a href="mailto:nratanov@urosario.edu.co"> nratanov@urosario.edu.co </a></p>  <hr size=1>      <p><b>    <center>Abstract</center></b></p>      <p align="justify"> In this paper we develop a financial market model based on continuous time random motions with alternating constant velocities and with jumps occurring when the velocity switches. If jump directions are in the certain correspondence with the velocity directions of the underlying random motion with respect to the interest rate, the model is free of arbitrage and complete. Memory effects of this model are discussed. </p>      <p><b>Key words:</b> Jump telegraph process, european option pricing, perfect hedging, self-financing strategy, fundamental equation, historical volatility. </p>  <hr size=1> <i>2000 Mathematics Subject Classification: Primary: 91B28. Secondary: 60J75</i> <hr size=1>      <p><b>    ]]></body>
<body><![CDATA[<center>Resumen</center></b></p>      <p align="justify"> En este art&iacute;culo introducimos un modelo de mercado financiero basado en movimientos aleatorios con la alternancia de velocidades y con saltos que ocurren cuando la velocidad se cambia. Este modelo es libre del arbitraje si las direcciones de saltos est&aacute;n en cierta correspondencia con las direcciones de velocidades del movimiento subyacente. Suponemos que la tasa de inter&eacute;s depende del estado de mercado. Las estrategias reproducibles para opciones son construidas en detalles. Se obtienen las f&oacute;rmulas de forma cerrada para los precios de opci&oacute;n. </p>      <p><b>Palabras clave:</b> Procesos salto de tel&eacute;grafo, opci&oacute;n europea de valoraci&oacute;n, protecci&oacute;n total, estrategia de auto financiaci&oacute;n, ecuaci&oacute;n fundamental, volatilidad hist&oacute;rica.</p>  <hr size=1>      <p>Texto completo disponible en <a href="pdf/rcm/v41s1/v41s1a07.pdf">PDF</a></p>  <hr size=1>      <p><b><font size="3">References</font></b></p>      <!-- ref --><p> 1 V. ANH & A. INOUE, Financial markets with memory I: Dynamic models, <i>Stochastic Analysis and Applications</i> 23 (2005), 275-300. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000018&pid=S0034-7426200700030000700001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 2 J. JACOD & A. N. SHIRYAEV, <i>Limit Theorems for Stochastic Processes</i>, Springer- Verlag, Berlin, 1987. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000019&pid=S0034-7426200700030000700002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 3 X. GUO, Information and option pricing, <i>Quant. Finance</i> 1 (2001), 38-44. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000020&pid=S0034-7426200700030000700003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 4 G. DI MASI, Y. KABANOV & W. RUNGGALDIER, Mean-variance hedging of options on stocks with Markov volatilities, <i>Theory Probab. Appl.</i> 39 (1994), 172-182. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000021&pid=S0034-7426200700030000700004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 5 M. KAC, Probability and Related Topics in Physical Sciences, Interscience, London, 1959. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000022&pid=S0034-7426200700030000700005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p> 6 N. RATANOV, A jump telegraph model for option pricing, Preprint No. 58, Universidad del Rosario, 2004 (accepted to Quant. Finance). &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000023&pid=S0034-7426200700030000700006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> ]]></body><back>
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