{"id":17110,"date":"2021-07-07T15:48:58","date_gmt":"2021-07-07T15:48:58","guid":{"rendered":"https:\/\/analystprep.com\/study-notes\/?p=17110"},"modified":"2024-04-06T10:52:07","modified_gmt":"2024-04-06T10:52:07","slug":"describe-the-assumptions-concerning-the-evolution-of-spot-rates-in-relation-to-forward-rates-implicit-in-active-bond-portfolio-management","status":"publish","type":"post","link":"https:\/\/analystprep.com\/study-notes\/cfa-level-2\/describe-the-assumptions-concerning-the-evolution-of-spot-rates-in-relation-to-forward-rates-implicit-in-active-bond-portfolio-management\/","title":{"rendered":"Assumptions Relating to the Evolution of Spot Rates"},"content":{"rendered":"<p><iframe loading=\"lazy\" src=\"\/\/www.youtube.com\/embed\/ovQh3D6WBOw\" width=\"611\" height=\"343\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\r\n<p>Recall from the first learning objective of this reading that the forward rate lies above the spot rate for an upward sloping spot curve. On the other hand, the forward rate in a downward sloping spot curve lies below the spot rate.<\/p>\r\n<p>This relationship in a downward sloping spot curve is shown in the figure below:<\/p>\r\n<h3><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-26484\" src=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/07\/Spot-Vs.-Forward-Rates-1.jpg\" alt=\"Spot Vs. Forward Rates\" width=\"1590\" height=\"1175\" srcset=\"https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/07\/Spot-Vs.-Forward-Rates-1.jpg 1590w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/07\/Spot-Vs.-Forward-Rates-1-300x222.jpg 300w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/07\/Spot-Vs.-Forward-Rates-1-1024x757.jpg 1024w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/07\/Spot-Vs.-Forward-Rates-1-768x568.jpg 768w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/07\/Spot-Vs.-Forward-Rates-1-1536x1135.jpg 1536w, https:\/\/analystprep.com\/study-notes\/wp-content\/uploads\/2021\/07\/Spot-Vs.-Forward-Rates-1-400x296.jpg 400w\" sizes=\"auto, (max-width: 1590px) 100vw, 1590px\" \/>The Spot Rate for Long-Maturity Securities<\/h3>\r\n<p>The spot rate for a bond with a maturity greater than 1 is equal to the <em><strong>geometric mean<\/strong><\/em> of the one-period spot rate and a series of one-year forward rates.\u00a0<\/p>\r\n<p>From the forward rate model:<\/p>\r\n<p>$$ \\left(1+S_T\\right)^T=(1+S_1)\\left[1+f\\left(1,T-1\\right)\\right]^{T-1} $$<\/p>\r\n<p>Which can be expanded to:<\/p>\r\n<p>If \\(t=1\\),<\/p>\r\n<p>$$ \\begin{align*} &amp; \\left(1+S_T\\right)^T \\\\ &amp; =(1+S_1)(1+f(1,1)(1+f(2,1)(1+f\\left(3,1\\right)\\ldots (1+f\\left(T-1,1\\right)\\ldots({1}) \\\\ &amp; S_T \\\\ &amp; =[(1+S_1)(1+f(1,1)(1+f(2,1)(1+f\\left(3,1\\right)\\ldots \\\\ &amp; \\left(1+f\\left(T-1,1\\right)\\right]^\\frac{1}{T}-1\\ldots({2}) \\end{align*} $$<\/p>\r\n<p>Contrary to the unbiased expectations theory, active bond portfolio management suggests that forward rates are <em><strong>biased predictors<\/strong><\/em> of future spot rates. In other words, the forward curve does not accurately forecast future spot rates.<\/p>\r\n<p>Thus, an active portfolio manager tries to outperform the bond market by forecasting how the future spot rates will differ from those reflected by the current forward curve.<\/p>\r\n<h4>Example: Spot and Forward Prices and Rates<\/h4>\r\n<p>The following information relates to three zero-coupon bonds.<\/p>\r\n<p>$$ \\begin{array}{c|c} \\textbf{Maturity} &amp; \\textbf{Spot Rates} \\\\ \\hline 1 &amp; 10\\% \\\\ \\hline 2 &amp; 11\\% \\\\ \\hline 3 &amp; 12\\% \\end{array} $$<\/p>\r\n<ol style=\"list-style-type: lower-roman;\" type=\"a\">\r\n\t<li>Calculate the implied one-year forward rate for a zero-coupon bond issued one year from today (i.e., f (1,1)).<\/li>\r\n\t<li>Calculate the implied one-year forward rate for a zero-coupon bond issued two years from today (i.e., f (2,1)).<\/li>\r\n\t<li>Calculate the two-year spot rate and the three-year spot rate assuming that the spot rates evolve as implied by the current forward curve.<\/li>\r\n<\/ol>\r\n<p><strong>Solution<\/strong><\/p>\r\n<ol style=\"list-style-type: lower-roman;\" type=\"a\">\r\n\t<li>\\(f (1,1)\\)\r\n\r\n\r\n<p>$$ \\begin{align*} (1+f\\left(1,1\\right)) &amp;=\\frac{\\left(1+S_2\\right)^2}{\\left(1+S_1\\right)} \\\\ f\\left(1,1\\right) &amp; =\\frac{{1.11}^2}{1.10}-1=1.1201-1=12.01\\% \\end{align*} $$<\/p>\r\n<\/li>\r\n\t<li>\\(f (2,1)\\)\r\n\r\n\r\n<p>$$ \\begin{align*} (1+f\\left(2,1)\\right) &amp;=\\frac{\\left(1+S_3\\right)^3}{\\left(1+S_2\\right)^2} \\\\ f\\left(1,2\\right) &amp; =\\frac{{1.12}^3}{{1.11}^2}-1=14.03\\% \\end{align*} $$<\/p>\r\n<\/li>\r\n\t<li>Geometric averages\r\n\r\n\r\n<p>$$ \\begin{align*} \\left(1+S_2\\right)^2 &amp; =(1+S_1)(1+f(1,1)) \\\\ S_2 &amp; =\\left[\\left(1+0.10\\right)\\left(1+0.1201\\right)\\right]^\\frac{1}{2}-1\\approx11\\% \\\\ \\left(1+S_3\\right)^3 &amp; =[\\left(1+S_1\\right)(1+f(1,1)(1+f\\left(2,1\\right)] \\\\ S_3 &amp;=\\left[\\left(1.10\\right)\\left(1.1201\\right)\\left(1.1403\\right)\\right]^{\\left(\\frac{1}{3}\\right)}-1 \\\\ &amp; =\\approx12\\% \\end{align*} $$<\/p>\r\n<\/li>\r\n<\/ol>\r\n<blockquote style=\"font: normal;\">\r\n<h2>Question<\/h2>\r\n<p>A bond whose expected spot rate is lower than the current forward rate is <em>most likely<\/em>:<\/p>\r\n<ol type=\"A\">\r\n\t<li>Undervalued.<\/li>\r\n\t<li>Overvalued.<\/li>\r\n\t<li>Fairly valued.<\/li>\r\n<\/ol>\r\n<h3>Solution<\/h3>\r\n<p><strong>The correct answer is A.<\/strong><\/p>\r\n<p>The bond\u2019s expected price determined using a lower expected discount rate (spot rate) is higher than the price obtained using the current forward rate discount factor. This implies that the bond will be undervalued.<\/p>\r\n<\/blockquote>\r\n<p>Reading 28: The Term Structure and Interest Rate Dynamics<\/p>\r\n<p><em>LOS 28(c) Describe the assumptions concerning the evolution of spot rates in relation to forward rates implicit in active bond portfolio management.<\/em><\/p>\r\n<!-- \/wp:post-content -->\r\n\n            <div \n                class=\"elfsight-widget-pricing-table elfsight-widget\" \n                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On the other hand, the forward rate in a downward sloping spot curve lies below the&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[102,472],"tags":[553,216,548,547],"class_list":["post-17110","post","type-post","status-publish","format-standard","hentry","category-cfa-level-2","category-fixed-income","tag-assumptions-relating-to-the-evolution-of-spot-rates","tag-cfa-level-2","tag-fixed-income","tag-reading-32","blog-post","no-post-thumbnail","animate"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Assumptions Relating to the Evolution of Spot Rates - CFA, FRM, and Actuarial Exams Study Notes<\/title>\n<meta name=\"description\" content=\"Understand the relationship between spot rates and forward rates in bond valuation, including geometric mean calculations.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/analystprep.com\/study-notes\/cfa-level-2\/describe-the-assumptions-concerning-the-evolution-of-spot-rates-in-relation-to-forward-rates-implicit-in-active-bond-portfolio-management\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Assumptions Relating to the Evolution of Spot Rates - 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