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Homework 2 </title> 
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<h2 class="titleHead">Math 489/889<br />
Stochastic Processes and<br />
Advanced Mathematical Finance<br />
Homework 2 </h2>
<div class="author" ><span 
class="cmr-12">Steve Dunbar</span></div>
<br />
<div class="date" ><span 
class="cmr-12">Due Monday, Sept 13, 2010</span></div>
   </div>
     <ol  class="enumerate1" >
     <li 
  class="enumerate" id="x1-3x1">Consider the hypothetical country of Elbonia, where the government has
     declared a &#x201C;currency band&#x201D; policy. This means exchange rate between the
     domestic currency, the Elbonian Bongo Buck, denoted by EBB, and the
     US Dollar is guaranteed to fluctuate in a prescribed band, namely:
     <!--tex4ht:inline--><!--l. 22--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="block" >
                                <mn>0</mn><mo 
class="MathClass-punc">.</mo><mn>9</mn><mn>5</mn><!--mstyle 
class="text"--><mtext  >&#x00A0;USD</mtext><!--/mstyle--> <mo 
class="MathClass-rel">&#x2264;</mo><!--mstyle 
class="text"--><mtext  >&#x00A0;EBB</mtext><!--/mstyle--> <mo 
class="MathClass-rel">&#x2264;</mo> <mn>1</mn><mo 
class="MathClass-punc">.</mo><mn>0</mn><mn>5</mn><!--mstyle 
class="text"--><mtext  >&#x00A0;USD</mtext><!--/mstyle-->
</math>
     <!--l. 24--><p class="nopar" > for at least one year. Suppose also that the government has issued 1-year
     bonds denominated in the EBB. The government is so shaky that it must
     pay a continuously compounded interest rate of 20%. Assuming that the
     corresponding continuously compounded interest rate for US lending and
     borrowing is 4%, show that there is an arbitrage opportunity. In a sentence

     explain the risk associated with this transaction.
     </p></li>
     <li 
  class="enumerate" id="x1-5x2">Consider a market that has
         <ol  class="enumerate2" >
         <li 
  class="enumerate" id="x1-7x1">a stock (also called a security or asset), current price <!--l. 37--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>S</mi></math>
         </li>
         <li 
  class="enumerate" id="x1-9x2">a loan market so that money (also called a bond) can be borrowed or
         loaned at an annual interest rate of <!--l. 39--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>r</mi></math>
         compounded continuously.</li></ol>
     <!--l. 42--><p class="noindent" >At the end of a time period <!--l. 42--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>T</mi></math>,
     the security will either increase in value by a factor
     <!--l. 43--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>U</mi></math> to
     <!--l. 43--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>S</mi><mi 
>U</mi></math>, or decrease in
     value by a factor <!--l. 44--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>D</mi></math>
     to value <!--l. 44--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>S</mi><mi 
>D</mi></math>.
     Show that a forward contract with strike price
     <!--l. 45--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>k</mi></math>
     that, is, a contract to buy the security at time
     <!--l. 46--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>T</mi></math> with potential
     values <!--l. 47--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>S</mi><mi 
>U</mi> <mo 
class="MathClass-bin">&#x2212;</mo> <mi 
>k</mi></math> and
     <!--l. 47--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>S</mi><mi 
>D</mi> <mo 
class="MathClass-bin">&#x2212;</mo> <mi 
>k</mi></math> should have the
     strike price set at <!--l. 48--><math 
 xmlns="http://www.w3.org/1998/Math/MathML" display="inline" ><mi 
>S</mi><mo class="qopname">exp</mo><!--nolimits--><mrow ><mo 
class="MathClass-open">(</mo><mrow><mi 
>r</mi><mi 
>T</mi></mrow><mo 
class="MathClass-close">)</mo></mrow></math>
     to avoid an arbitrage opportunity.
</p>
     </li></ol>
    
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