{"id":92,"date":"2025-08-15T16:35:00","date_gmt":"2025-08-15T16:35:00","guid":{"rendered":"https:\/\/themarketyield.com\/risk-behind-investment-grade-bonds-why-high-rated-bonds-carry-risks\/"},"modified":"2025-08-15T16:58:12","modified_gmt":"2025-08-15T16:58:12","slug":"risk-behind-investment-grade-bonds-why-high-rated-bonds-carry-risks","status":"publish","type":"post","link":"https:\/\/themarketyield.com\/fr\/risk-behind-investment-grade-bonds-why-high-rated-bonds-carry-risks\/","title":{"rendered":"Le risque associ\u00e9 aux obligations de qualit\u00e9 investissement"},"content":{"rendered":"<p>Les risques li\u00e9s aux obligations de qualit\u00e9\u00a0: pourquoi m\u00eame les obligations \u00e0 notation \u00e9lev\u00e9e comportent des risques tels que l\u2019\u00e9rosion due \u00e0 l\u2019inflation, les variations des taux d\u2019int\u00e9r\u00eat et les incidents de cr\u00e9dit<\/p>\n\n\n\n<p>Tout le monde appr\u00e9cie une bonne s\u00e9curit\u00e9 financi\u00e8re, et beaucoup pensent que les obligations de qualit\u00e9 offrent pr\u00e9cis\u00e9ment cela. En r\u00e9alit\u00e9, la situation est plus nuanc\u00e9e\u00a0: les notations seules ne r\u00e9v\u00e8lent rien de plus complexe.<\/p>\n\n\n\n<p>Investir, ce n&#039;est pas seulement rechercher des rendements\u00a0; c&#039;est aussi prot\u00e9ger son capital durement gagn\u00e9. M\u00eame si les obligations b\u00e9n\u00e9ficient d&#039;une notation \u00e9lev\u00e9e, les investisseurs doivent rester vigilants face aux nombreux risques qui y sont pourtant \u00e9vidents.<\/p>\n\n\n\n<p>Cet article propose une analyse approfondie des risques li\u00e9s aux obligations de qualit\u00e9 investissement, m\u00eame les plus fiables, et fournit aux investisseurs des informations pratiques pour prendre des d\u00e9cisions \u00e9clair\u00e9es.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Au-del\u00e0 du bouclier des hautes audiences<\/h2>\n\n\n\n<p>Une notation de cr\u00e9dit \u00e9lev\u00e9e est souvent per\u00e7ue comme une garantie de s\u00e9curit\u00e9, mais ce n&#039;est pas tout. Les obligations de qualit\u00e9 investissement pr\u00e9sentent des failles cach\u00e9es qui peuvent surprendre m\u00eame les investisseurs les plus aguerris.<\/p>\n\n\n\n<p>Imaginez les obligations de qualit\u00e9 investissement comme de solides parapluies par une journ\u00e9e ensoleill\u00e9e. Elles peuvent para\u00eetre excessives au premier abord, mais des intemp\u00e9ries impr\u00e9vues \u2014 comme des turbulences sur les march\u00e9s \u2014 peuvent soudainement r\u00e9v\u00e9ler leur v\u00e9ritable solidit\u00e9 ou leurs faiblesses.<\/p>\n\n\n\n<ul>\n<li>Les taux d&#039;int\u00e9r\u00eat pourraient augmenter de fa\u00e7on inattendue, entra\u00eenant une baisse du prix des obligations et une diminution de la valeur de votre portefeuille.<\/li>\n\n\n\n<li>M\u00eame les \u00e9metteurs les mieux not\u00e9s peuvent subir des d\u00e9gradations soudaines de leur note de cr\u00e9dit si leurs b\u00e9n\u00e9fices chutent ou si leurs strat\u00e9gies \u00e9chouent.<\/li>\n\n\n\n<li>L&#039;inflation \u00e9rode silencieusement les rendements fixes, ce qui affaiblit le pouvoir d&#039;achat plus que pr\u00e9vu.<\/li>\n\n\n\n<li>La liquidit\u00e9 peut s&#039;\u00e9vaporer en p\u00e9riode de tensions, ce qui rend difficile la vente lorsqu&#039;on souhaite se d\u00e9sengager.<\/li>\n\n\n\n<li>La psychologie des march\u00e9s \u00e9volue rapidement, modifiant le sentiment du march\u00e9 obligataire en un clin d&#039;\u0153il.<\/li>\n\n\n\n<li>Les consid\u00e9rations fiscales transforment parfois les gains anticip\u00e9s en d\u00e9penses impr\u00e9vues.<\/li>\n<\/ul>\n\n\n\n<p>Ces risques persistant, les investisseurs doivent consid\u00e9rer les notations \u00e9lev\u00e9es comme un premier filtre, et non comme une garantie. Une vision globale du contexte des risques permet de prendre des d\u00e9cisions plus \u00e9clair\u00e9es et d&#039;avoir l&#039;esprit plus tranquille.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La menace silencieuse de l&#039;inflation pour les investisseurs obligataires<\/h2>\n\n\n\n<p>Prenons l&#039;exemple d&#039;une personne ayant souscrit une obligation \u00e0 10 ans rapportant 2,51 Tbp3 alors que l&#039;inflation avoisine les 3,51 Tbp3. Son rendement r\u00e9el diminue discr\u00e8tement chaque ann\u00e9e. Le capital de l&#039;obligation reste intact, mais les d\u00e9penses courantes augmentent plus vite que ces modestes versements d&#039;int\u00e9r\u00eats.<\/p>\n\n\n\n<p>Imaginez un retrait\u00e9 vivant d&#039;une rente fixe provenant d&#039;obligations. Au bout de cinq ans, ses factures d&#039;\u00e9lectricit\u00e9 et d&#039;alimentation ont augment\u00e9, mais ses mensualit\u00e9s, elles, sont rest\u00e9es les m\u00eames. Cet \u00e9cart repr\u00e9sente le co\u00fbt silencieux de l&#039;inflation\u00a0: constant, cumulatif et souvent sous-estim\u00e9.<\/p>\n\n\n\n<p>Dans un autre exemple, un investisseur a choisi un portefeuille d&#039;obligations d&#039;entreprises de haute qualit\u00e9. Si les r\u00e9sultats trimestriels sont prometteurs, leur pouvoir d&#039;achat r\u00e9el diminue progressivement, rendant plus difficile l&#039;atteinte des objectifs fix\u00e9s.<\/p>\n\n\n\n<p>L&#039;inflation ne fera pas la une des journaux du jour au lendemain, mais son impact insidieux et implacable en fait l&#039;un des risques les plus fiables pour les investisseurs obligataires. La reconna\u00eetre et s&#039;y pr\u00e9parer, c&#039;est d\u00e9j\u00e0 la moiti\u00e9 du chemin parcouru.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Facteurs d\u00e9terminant la valeur r\u00e9elle des obligations<\/h2>\n\n\n\n<p>M\u00eame si vous d\u00e9tenez une obligation b\u00e9n\u00e9ficiant d&#039;une excellente notation de cr\u00e9dit, sa valeur n&#039;est pas immuable. Son prix sur le march\u00e9 est influenc\u00e9 par divers facteurs, certains \u00e9vidents, d&#039;autres plus subtils.<\/p>\n\n\n\n<ol>\n<li>\u00c9volution des taux d&#039;int\u00e9r\u00eat\u00a0: la valeur des obligations diminue lorsque les taux augmentent, car les nouvelles \u00e9missions offrent de meilleurs rendements. L&#039;inverse est \u00e9galement vrai\u00a0: la baisse des taux fait grimper le prix des obligations existantes.<\/li>\n\n\n\n<li>Anticipations d&#039;inflation\u00a0: une inflation anticip\u00e9e plus \u00e9lev\u00e9e incite les investisseurs \u00e0 exiger des rendements plus importants, ce qui fait baisser le prix des obligations existantes en compensation de la perte de pouvoir d&#039;achat.<\/li>\n\n\n\n<li>Modifications de la notation de cr\u00e9dit de l&#039;\u00e9metteur\u00a0: si une entreprise ou un gouvernement est confront\u00e9 \u00e0 des turbulences ou \u00e0 des difficult\u00e9s financi\u00e8res, sa notation peut \u00eatre abaiss\u00e9e, ce qui rend ses obligations moins attractives et plus volatiles.<\/li>\n\n\n\n<li>Tendances en mati\u00e8re de liquidit\u00e9\u00a0: Sur des march\u00e9s turbulents, les investisseurs peuvent avoir des difficult\u00e9s \u00e0 vendre rapidement leurs obligations sans fortes d\u00e9cotes. Le manque de liquidit\u00e9 accentue les pertes et les probl\u00e8mes op\u00e9rationnels.<\/li>\n\n\n\n<li>Sentiment du march\u00e9\u00a0: La psychologie des groupes et l\u2019actualit\u00e9 peuvent provoquer des changements soudains \u2013 ventes paniques, fuite vers la qualit\u00e9 ou achats gr\u00e9gaires \u2013 qui ont tous un impact consid\u00e9rable sur le prix des obligations.<\/li>\n\n\n\n<li>Facteurs fiscaux\u00a0: L\u2019\u00e9volution des r\u00e8gles ou des politiques fiscales a une incidence sur les rendements apr\u00e8s imp\u00f4t, notamment pour les obligations municipales ou certaines obligations d\u2019entreprises pour lesquelles les avantages fiscaux constituent un atout.<\/li>\n\n\n\n<li>Chocs externes\u00a0: des \u00e9v\u00e9nements tels que des troubles g\u00e9opolitiques ou des d\u00e9fauts de paiement \u00e0 grande \u00e9chelle se r\u00e9percutent sur tous les march\u00e9s obligataires, modifiant la valeur ind\u00e9pendamment de la notation initiale ou de l\u2019\u00e9ch\u00e9ance.<\/li>\n<\/ol>\n\n\n\n<p>L&#039;observation concr\u00e8te de ces facteurs met en \u00e9vidence que les notations ne repr\u00e9sentent qu&#039;une partie d&#039;un tableau bien plus vaste. Il est essentiel pour les investisseurs sensibles au risque de rester vigilants.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comparaison des risques li\u00e9s aux \u00e9v\u00e9nements : taux d&#039;int\u00e9r\u00eat, inflation et cr\u00e9dit<\/h2>\n\n\n\n<p>Le risque de taux d&#039;int\u00e9r\u00eat et le risque d&#039;inflation semblent similaires, mais leurs cons\u00e9quences pour les investisseurs sont tr\u00e8s diff\u00e9rentes. Un investisseur peut \u00e9viter les d\u00e9fauts de paiement, tout en subissant des pertes en raison d&#039;une mauvaise appr\u00e9ciation des variations de taux ou des tendances de l&#039;inflation.<\/p>\n\n\n\n<p>Prenons l&#039;exemple classique d&#039;une hausse soudaine des taux. Une obligation arrivant \u00e0 \u00e9ch\u00e9ance dans 15 ans voit sa valeur chuter brutalement lorsque les taux s&#039;envolent. Mais une obligation \u00e0 court terme est peu affect\u00e9e, jusqu&#039;\u00e0 ce que l&#039;inflation s&#039;installe et \u00e9rode les rendements r\u00e9els.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><thead><tr><th>Type de risque<\/th><th>Impact imm\u00e9diat<\/th><th>Effet typique \u00e0 long terme<\/th><\/tr><\/thead><tbody><tr><td>Risque de taux d&#039;int\u00e9r\u00eat<\/td><td>prix des obligations plus bas<\/td><td>Risque de perte en capital en cas de vente avant l&#039;\u00e9ch\u00e9ance<\/td><\/tr><tr><td>Risque d&#039;inflation<\/td><td>R\u00e9duit le rendement r\u00e9el<\/td><td>Diminution du pouvoir d&#039;achat au fil du temps<\/td><\/tr><tr><td>Risque li\u00e9 aux \u00e9v\u00e9nements de cr\u00e9dit<\/td><td>D\u00e9classements, risque de d\u00e9faut de paiement<\/td><td>Risque de d\u00e9faut, pertes sur le capital\/les int\u00e9r\u00eats<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Le tableau d\u00e9taille la mani\u00e8re dont chaque risque se manifeste rapidement et sur plusieurs ann\u00e9es, prouvant ainsi qu&#039;une notation \u00e9lev\u00e9e d&#039;une obligation ne prot\u00e8ge pas contre ces effets divers et parfois imbriqu\u00e9s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quand les d\u00e9gradations bouleversent les attentes<\/h2>\n\n\n\n<p>Consid\u00e9rez une obligation d&#039;entreprise de haute qualit\u00e9 comme une voiture familiale fiable. Si vous n\u00e9gligez l&#039;entretien ou ignorez les voyants d&#039;alerte, m\u00eame le v\u00e9hicule le plus fiable peut tomber en panne ou perdre de la valeur du jour au lendemain.<\/p>\n\n\n\n<p>Il arrive que des entreprises rencontrent des difficult\u00e9s impr\u00e9vues\u00a0: all\u00e9gations de fraude, krachs boursiers, voire \u00e9volution des pr\u00e9f\u00e9rences des consommateurs. Ces probl\u00e8mes peuvent amener les agences de notation \u00e0 revoir leurs perspectives, faisant passer une note \u00ab\u00a0investissement\u00a0\u00bb \u00e0 une note \u00ab\u00a0sp\u00e9culative\u00a0\u00bb du jour au lendemain.<\/p>\n\n\n\n<p>Lorsque la notation d&#039;une obligation se d\u00e9grade, les paiements d&#039;int\u00e9r\u00eats peuvent se poursuivre, mais le prix du march\u00e9 chute brutalement, entra\u00eenant des pertes consid\u00e9rables pour les d\u00e9tenteurs contraints de vendre. L&#039;exemple le plus frappant est celui des obligations d&#039;Enron, pass\u00e9es de la cat\u00e9gorie \u00ab\u00a0investissement\u00a0\u00bb \u00e0 la cat\u00e9gorie \u00ab\u00a0d\u00e9faut de paiement\u00a0\u00bb du jour au lendemain.<\/p>\n\n\n\n<p>Les d\u00e9gradations de notation entra\u00eenent souvent des ventes forc\u00e9es de la part de fonds ou d&#039;institutions aux mandats d&#039;investissement stricts, ce qui peut engendrer des pertes consid\u00e9rables. M\u00eame les investisseurs les plus aguerris peuvent \u00eatre surpris par la rapidit\u00e9 et l&#039;ampleur de la chute.<\/p>\n\n\n\n<p>La diversification des investissements et la vigilance quant aux fondamentaux des \u00e9metteurs contribuent \u00e0 att\u00e9nuer ces chocs, mais la vigilance ne peut \u00e9liminer la possibilit\u00e9 d&#039;un \u00e9v\u00e9nement de cr\u00e9dit soudain.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Principaux risques que tout investisseur devrait surveiller<\/h2>\n\n\n\n<ul>\n<li>Des hausses inattendues des taux d&#039;int\u00e9r\u00eat pourraient rapidement faire chuter la valeur de vos obligations.<\/li>\n\n\n\n<li>Les incidents de cr\u00e9dit, m\u00eame rares, peuvent ruiner des portefeuilles du jour au lendemain.<\/li>\n\n\n\n<li>L&#039;inflation, en s&#039;insinuant lentement, diminue la valeur des paiements futurs et du capital.<\/li>\n\n\n\n<li>Les p\u00e9nuries de liquidit\u00e9s rendent difficile la sortie de certaines positions sans subir de lourdes pertes.<\/li>\n\n\n\n<li>Les modifications de la l\u00e9gislation fiscale peuvent modifier consid\u00e9rablement les rendements apr\u00e8s imp\u00f4t.<\/li>\n\n\n\n<li>Les informations sp\u00e9cifiques \u00e0 un \u00e9metteur peuvent parfois engendrer des risques ponctuels importants.<\/li>\n\n\n\n<li>Les d\u00e9calages d&#039;horizon temporel entra\u00eenent une volatilit\u00e9 des march\u00e9s \u00e0 des moments inopportuns.<\/li>\n<\/ul>\n\n\n\n<p>En se concentrant sur tous ces aspects plut\u00f4t que sur un seul risque, on construit un filet de s\u00e9curit\u00e9 plus large. Chaque menace exige sa propre strat\u00e9gie d&#039;att\u00e9nuation.<\/p>\n\n\n\n<p>Les investisseurs qui restent proactifs, qui surveillent ces signes et qui r\u00e9agissent clairement, se placent dans une meilleure position pour naviguer efficacement sur les march\u00e9s obligataires.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Aper\u00e7us de sc\u00e9narios\u00a0: Diff\u00e9rents risques en action<\/h2>\n\n\n\n<p>Les taux d&#039;int\u00e9r\u00eat n&#039;augmentent pas toujours comme le pr\u00e9voient les m\u00e9dias. S&#039;ils baissent, les d\u00e9tenteurs d&#039;obligations anciennes \u00e0 taux d&#039;int\u00e9r\u00eat \u00e9lev\u00e9s en profitent\u00a0; mais si l&#039;inflation augmente de fa\u00e7on inattendue, ce gain est annul\u00e9 par la hausse des prix ailleurs.<\/p>\n\n\n\n<p>Imaginez maintenant deux investisseurs\u00a0: l\u2019un ach\u00e8te une obligation du Tr\u00e9sor \u00e0 long terme, l\u2019autre privil\u00e9gie les obligations d\u2019entreprises \u00e0 court terme. Le premier est expos\u00e9 aux fluctuations de prix et \u00e0 l\u2019\u00e9rosion due \u00e0 l\u2019inflation\u00a0; le second, au risque de cr\u00e9dit et \u00e0 un risque potentiel de rendements plus faibles. Tous deux sont confront\u00e9s au risque, mais sous des angles diff\u00e9rents.<\/p>\n\n\n\n<p>Enfin, un sc\u00e9nario hypoth\u00e9tique\u00a0: supposons qu\u2019un choc \u00e9conomique provoque une d\u00e9gradation massive des notes de cr\u00e9dit. Les investisseurs ayant diversifi\u00e9 leurs placements et suivi activement l\u2019actualit\u00e9 pourraient limiter les pertes les plus importantes, tandis que d\u2019autres seraient confront\u00e9s \u00e0 un r\u00e9\u00e9quilibrage soudain de leur portefeuille.<\/p>\n\n\n\n<p>Ces exemples montrent bien que les risques n&#039;agissent pas isol\u00e9ment. Parfois, ils s&#039;encha\u00eenent\u00a0: l&#039;un en d\u00e9clenche un autre, ce qui exige une approche progressive pour les att\u00e9nuer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion : G\u00e9rer les liens avec prudence et clart\u00e9<\/h2>\n\n\n\n<p>Les obligations de qualit\u00e9 offrent une stabilit\u00e9 pr\u00e9cieuse, mais leurs risques ne doivent pas \u00eatre sous-estim\u00e9s. L&#039;inflation, les taux d&#039;int\u00e9r\u00eat, les incidents de cr\u00e9dit et d&#039;autres facteurs peuvent \u00e9roder discr\u00e8tement leur valeur ou provoquer des pertes soudaines.<\/p>\n\n\n\n<p>La prise en compte de la multitude de risques \u2014 et non le simple fait de se fier \u00e0 des notations \u00e9lev\u00e9es \u2014 permet aux investisseurs de mieux prot\u00e9ger leur capital et d&#039;atteindre leurs objectifs \u00e0 long terme.<\/p>\n\n\n\n<p>La mise en place de strat\u00e9gies de superposition, telles que la diversification des \u00e9ch\u00e9ances, le suivi des fondamentaux des \u00e9metteurs et la surveillance des tendances macro\u00e9conomiques, offre une protection concr\u00e8te.<\/p>\n\n\n\n<p>En fin de compte, investir dans les obligations, c&#039;est comme naviguer avec une carte et des pr\u00e9visions m\u00e9t\u00e9orologiques : rester attentif \u00e0 l&#039;\u00e9volution de la situation vous sera toujours plus profitable que de vous fier uniquement aux notations.<\/p>\n\n\n\n<p>Une pr\u00e9paration minutieuse, un suivi attentif et une grande flexibilit\u00e9 offrent aux investisseurs les meilleures chances de maintenir la solidit\u00e9 et la r\u00e9silience de leurs portefeuilles d&#039;obligations de qualit\u00e9.<\/p>","protected":false},"excerpt":{"rendered":"<p>M\u00eame les obligations les plus s\u00fbres comportent des risques, de l&#039;\u00e9rosion due \u00e0 l&#039;inflation aux incidents de cr\u00e9dit. D\u00e9couvrez en d\u00e9tail comment les obligations de qualit\u00e9 peuvent \u00eatre confront\u00e9es \u00e0 des pi\u00e8ges inattendus et apprenez des solutions pratiques pour prot\u00e9ger votre argent.<\/p>","protected":false},"author":44,"featured_media":176,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Risk Behind Investment-Grade Bonds - The Market Yield<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/themarketyield.com\/fr\/risk-behind-investment-grade-bonds-why-high-rated-bonds-carry-risks\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Risk Behind Investment-Grade Bonds - The Market Yield\" \/>\n<meta property=\"og:description\" content=\"Even the safest bonds have risks, from inflation erosion to credit events. 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