Pratique du Shadowing: Opportunity Cost and Tradeoffs - Apprendre l'anglais à l'oral avec la vidéo
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38 phrases
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- Once you master the economic way of thinking, you'll see the world in a very different way.
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Two fundamental economic concepts are everywhere you look: opportunity cost and tradeoffs.
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Let's start with opportunity cost.
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At this busy coffee shop, opportunity costs lie behind every decision.
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Like for Jenny -- she's here for her third date with Adam.
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Was that a good decision?
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After all, economics is all about studying decisions.
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Making a good decision is about comparing the benefits of that decision to the costs.
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The obvious costs for this date, for Jenny, were the Uber ride she paid for to get here and her grande chai tea latte with whole milk.
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But what's missing?
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Her opportunity cost.
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Opportunity cost means the value of the next best alternative.
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For instance, instead of going on her third date with Adam, Jenny could've been binge watching her favorite TV show.
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She might have been on a first date instead, with Roman.
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Or she might have been having breakfast with her very sweet sister.
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Let's say her next best option would have been breakfast with her sister.
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Does the benefit of this third date with Adam outweigh the opportunity cost?
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It might seem strange to think this way about romance, and it doesn't mean that it's about calculating every decision down to the last penny.
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Nonetheless, Jenny's time, attention, and energy -- those are scarce.
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And if she doesn't consider the alternatives at all, she might be wasting parts of her life.
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There's another fundamental related concept from economics: tradeoffs.
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Take these sprinklers in the ceiling of the coffee shop, for example.
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Adding sprinklers can make it safer during a fire, but they also can cost a lot of money to install.
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How much cheaper would the coffee be without them?
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In a world of scarce resources, one typically has to choose.
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There's a tradeoff -- safer buildings cost more, but that means the coffee can be more expensive.
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Hmm, the line is at the door here.
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Perhaps the owner has considered opening a second location.
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As the building code, however, becomes more stringent, the cost of opening an additional location goes up.
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It's not just the direct monetary costs of paying for things like sprinklers, it's also the opportunity costs of the extra time and effort to file permits, manage the work, and schedule inspections.
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A more stringent building code means a higher cost for opening up new businesses.
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And in turn, that higher cost can mean that fewer new businesses get opened.
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What's the right tradeoff between making buildings safer...
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and making it easier to launch new businesses?
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Once you see these tradeoffs, you'll find them everywhere you look: healthcare, food, the environment, education.
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One more decision to consider: if you're a teacher, should you spice up your economics class by checking out our free unit plan that uses this video?
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If you're a learner, should you watch another MRU video?
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Well, YouTube is full of entertaining videos, but please, of course, consider the opportunity costs.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « Opportunity Cost and Tradeoffs ». Les mots qui reviennent le plus souvent : cost, opportunity, decision, tradeoff, economic. Cette vidéo contient 38 phrases et 502 mots à répéter en shadowing. La partie parlée dure 4:32. Le locuteur parle à un rythme régulier d’environ 111 mots par minute, confortable pour le shadowing. 86 % des mots font partie des 3 000 mots les plus courants en anglais ; le reste mérite d’être vu avant de commencer. 7 de ses 38 phrases sont des questions : un bon entraînement pour l’intonation interrogative et les réponses courtes.
Vocabulaire clé de cette vidéo
Les 9 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| sprinkler nom | /ˈspɹiŋklɚ/ | arroseur, asperseur |
| stringent adjectif | /ˈstɹɪn.d͡ʒənt/ | strict |
| scarce adjectif | /ˈskɛɚs/ | rare |
| learner nom | /ˈlɜɹnəɹ/ | apprenant, apprenante |
| entertain verbe | /ˌɛntəˈteɪn/ | divertir |
| calculate verbe | /ˈkælkjʊleɪt/ | calculer |
| spouse nom | /spaʊ̯s/ | époux, épouse |
| nonetheless adverbe | /ˌnʌnðəˈlɛs/ | néanmoins |
| penny nom | /ˈpɛni/ | penny |
Les verbes à particule que vous entendrez
| Mot | Sens |
|---|---|
| check out verbe | mater, regarder |
| go up verbe | monter, s'élever |
| open up verbe | ouvrir |
Prononciation à surveiller
Le locuteur utilise 7 contractions et formes réduites, comme doesn't, you'll, you're. Prononcez-les sous leur forme courte, telles que vous les entendez.
Les sons difficiles pour les francophones :
- /tʃ/ et /dʒ/ — à ne pas adoucir en « ch » et « j »: stringent /ˈstɹɪn.d͡ʒənt/, binge /bɪnd͡ʒ/
- /r/ anglais — langue recourbée, sans frotter la gorge: sprinkler /ˈspɹiŋklɚ/, stringent /ˈstɹɪn.d͡ʒənt/, learner /ˈlɜɹnəɹ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Répétez phrase par phrase à vitesse normale, en reprenant chacune jusqu’à ce que votre rythme corresponde à celui du locuteur.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme sprinkler, stringent, scarce.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.