Ever wonder why everyone suddenly wants the same trainers, or... もっと見る
Economics1 閲覧数·更新日 Jun 9, 2026·5 ページKey Factors Influencing Consumer Demand
1 / 5
1
of 5
Understanding Demand Basics
Demand isn't just about price - it's about how willing and able people are to buy something at a given price. Think of it like this: you might want the latest iPhone, but if you can't afford it, there's no actual demand from you.
The Law of Demand tells us that when prices drop, people generally buy more (and vice versa). But here's where it gets interesting - sometimes demand changes even when the price stays exactly the same.
When something other than price affects how much people want to buy, the entire demand curve shifts. This is completely different from just moving along the curve when price changes. Understanding this difference will save you marks in exams!
Key Tip: Remember ceteris paribus - "all other things being equal". Economists use this to study one factor at a time, assuming everything else stays constant.
2
of 5
Related Goods: Substitutes and Complements
Substitute goods can replace each other - like Coke and Pepsi, or Netflix and Disney+. When Coke's price jumps up, suddenly Pepsi looks more attractive, so demand for Pepsi increases even though its price hasn't changed.
Complementary goods work together - think gaming consoles and games, or cars and petrol. If PlayStation 5 prices soar, fewer people buy the console, which means fewer people need PS5 games. So demand for games drops too.
This is dead useful for understanding real-world scenarios. When petrol prices spike, demand for fuel-efficient cars goes up whilst demand for gas-guzzling SUVs falls.
Quick Check: If two goods are substitutes and one gets more expensive, demand for the other increases. If they're complements and one gets pricier, demand for the other decreases.
3
of 5
Income Effects: Normal vs Inferior Goods
Your income massively affects what you buy, but not all goods react the same way. Normal goods are things you buy more of when you get richer - branded clothes, restaurant meals, or the latest tech.
Inferior goods work backwards - when your income rises, you actually buy less of them. Think own-brand instant noodles or second-hand clothes. Once you can afford better alternatives, you ditch the cheap stuff.
This explains why Penneys might see less demand during economic booms whilst Brown Thomas sees more. People trade up when they've got extra cash flowing in.
Real Example: Getting a part-time job means you might stop buying supermarket own-brand everything and start choosing branded products instead.
4
of 5
Tastes, Expectations, and Population Changes
Tastes and preferences drive massive demand shifts. One TikTok trend can make certain trainers explode in popularity overnight. Celebrity endorsements, health scares, or just changing fashions all shift demand curves dramatically.
Future price expectations create interesting behaviour. If you think concert tickets will cost more next week, you'll buy them now - increasing current demand. But if you expect phone prices to drop when the new model launches, you'll wait.
Population changes are straightforward but powerful. More people in an area means higher demand for local services. New housing estates boost demand for everything from groceries to hairdressers.
Exam Alert: Don't confuse a movement along the demand curve (price change only) with a shift of the entire curve (caused by these factors).
5
of 5
Putting It All Together
Here's your memory aid for exam success: T.R.I.B.E covers the main demand shifters - Tastes, Related goods, Income, Buyers (population), and Expectations of future prices.
Rightward shifts mean increased demand (more people want the good at every price level). Leftward shifts mean decreased demand (fewer people want it at every price level). The price itself hasn't changed - something else has influenced consumer behaviour.
Master the difference between demand changes and quantity demanded changes. This distinction appears in virtually every economics exam and catches loads of students out.
Exam Success: Practice identifying whether scenarios cause movements along the curve (price changes) or shifts of the entire curve (other factors). This skill will boost your marks significantly.
そんなこと聞いてくれるのを待ってたよ...
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Economics1 閲覧数·更新日 Jun 9, 2026·5 ページKey Factors Influencing Consumer Demand
Ever wonder why everyone suddenly wants the same trainers, or why nobody buys certain sweets anymore? It's not just about price - loads of other factors can change how much people want to buy something. Understanding these demand shifters is... もっと見る
1
of 5サインアップしてコンテンツを見よう。無料だよ！
- 全ドキュメントへのアクセス
- 成績アップ
- 数百万人の学生と一緒に学習
Understanding Demand Basics
Demand isn't just about price - it's about how willing and able people are to buy something at a given price. Think of it like this: you might want the latest iPhone, but if you can't afford it, there's no actual demand from you.
The Law of Demand tells us that when prices drop, people generally buy more (and vice versa). But here's where it gets interesting - sometimes demand changes even when the price stays exactly the same.
When something other than price affects how much people want to buy, the entire demand curve shifts. This is completely different from just moving along the curve when price changes. Understanding this difference will save you marks in exams!
Key Tip: Remember ceteris paribus - "all other things being equal". Economists use this to study one factor at a time, assuming everything else stays constant.
2
of 5サインアップしてコンテンツを見よう。無料だよ！
- 全ドキュメントへのアクセス
- 成績アップ
- 数百万人の学生と一緒に学習
Related Goods: Substitutes and Complements
Substitute goods can replace each other - like Coke and Pepsi, or Netflix and Disney+. When Coke's price jumps up, suddenly Pepsi looks more attractive, so demand for Pepsi increases even though its price hasn't changed.
Complementary goods work together - think gaming consoles and games, or cars and petrol. If PlayStation 5 prices soar, fewer people buy the console, which means fewer people need PS5 games. So demand for games drops too.
This is dead useful for understanding real-world scenarios. When petrol prices spike, demand for fuel-efficient cars goes up whilst demand for gas-guzzling SUVs falls.
Quick Check: If two goods are substitutes and one gets more expensive, demand for the other increases. If they're complements and one gets pricier, demand for the other decreases.
3
of 5サインアップしてコンテンツを見よう。無料だよ！
- 全ドキュメントへのアクセス
- 成績アップ
- 数百万人の学生と一緒に学習
Income Effects: Normal vs Inferior Goods
Your income massively affects what you buy, but not all goods react the same way. Normal goods are things you buy more of when you get richer - branded clothes, restaurant meals, or the latest tech.
Inferior goods work backwards - when your income rises, you actually buy less of them. Think own-brand instant noodles or second-hand clothes. Once you can afford better alternatives, you ditch the cheap stuff.
This explains why Penneys might see less demand during economic booms whilst Brown Thomas sees more. People trade up when they've got extra cash flowing in.
Real Example: Getting a part-time job means you might stop buying supermarket own-brand everything and start choosing branded products instead.
4
of 5サインアップしてコンテンツを見よう。無料だよ！
- 全ドキュメントへのアクセス
- 成績アップ
- 数百万人の学生と一緒に学習
Tastes, Expectations, and Population Changes
Tastes and preferences drive massive demand shifts. One TikTok trend can make certain trainers explode in popularity overnight. Celebrity endorsements, health scares, or just changing fashions all shift demand curves dramatically.
Future price expectations create interesting behaviour. If you think concert tickets will cost more next week, you'll buy them now - increasing current demand. But if you expect phone prices to drop when the new model launches, you'll wait.
Population changes are straightforward but powerful. More people in an area means higher demand for local services. New housing estates boost demand for everything from groceries to hairdressers.
Exam Alert: Don't confuse a movement along the demand curve (price change only) with a shift of the entire curve (caused by these factors).
5
of 5サインアップしてコンテンツを見よう。無料だよ！
- 全ドキュメントへのアクセス
- 成績アップ
- 数百万人の学生と一緒に学習
Putting It All Together
Here's your memory aid for exam success: T.R.I.B.E covers the main demand shifters - Tastes, Related goods, Income, Buyers (population), and Expectations of future prices.
Rightward shifts mean increased demand (more people want the good at every price level). Leftward shifts mean decreased demand (fewer people want it at every price level). The price itself hasn't changed - something else has influenced consumer behaviour.
Master the difference between demand changes and quantity demanded changes. This distinction appears in virtually every economics exam and catches loads of students out.
Exam Success: Practice identifying whether scenarios cause movements along the curve (price changes) or shifts of the entire curve (other factors). This skill will boost your marks significantly.
そんなこと聞いてくれるのを待ってたよ...
KnowunityのAIコンパニオンとは？
KnowunityのAIコンパニオンは学生向けに設計されたAIツールで、単なる答えを提供するだけではありません。数百万のKnowunityリソースを基に構築され、関連する情報、個別の学習プラン、クイズ、コンテンツをチャット内で直接提供し、あなたの個別の学習過程に適応します。
Knowunityアプリはどこでダウンロードできますか？
Google Play StoreとApple App Storeからアプリをダウンロードできます。
Knowunityは本当に無料ですか？
その通り！学習コンテンツへの無料アクセス、仲間の学生とのつながり、そして即座のサポートを手のひらで楽しもう。
人気コンテンツ
9探しているものが見つからない？他の教科も見てみよう。
生徒たちが愛用中 — あなたもきっと気に入るはず。
4.6/5App Store
4.7/5Google Play
このアプリはとても使いやすくて、デザインも良いです。今のところ探していたものは全て見つかったし、プレゼン資料からもたくさん学べました！絶対に課題でも使いたいと思います！もちろん、アイデアを得るのにもすごく役立ちます。
Stefan SiOSユーザー
このアプリは本当に素晴らしいです。学習ノートやサポート資料がとても豊富で[...]。例えば、私の苦手科目はフランス語なんですが、このアプリにはサポートオプションがたくさんあります。このアプリのおかげでフランス語が上達しました。誰にでもおすすめしたいです。
Samantha KlichAndroidユーザー
すごい、本当に驚いた。広告で何度も見かけたからアプリを試してみたら、めちゃくちゃ感動した。このアプリは学校で欲しかった「まさにこれ！」って感じのサポートで、特に練習問題や要点まとめみたいな機能がたくさんあって、個人的にすごく助かってる。
AnnaiOSユーザー