If the price of cinema tickets rises, and fewer people go to the cinema, this is an example of:

Question

BlackTom AI · Accepted Answer

The law of demand: when the price of a good rises, the quantity demanded of that good normally falls (and vice versa).

1. Relevant knowledge points and concepts
- Law of demand: an inverse relationship between price and quantity demanded, holding other factors constant (ceteris paribus).
- Quantity demanded vs. demand: a price change causes a movement along the demand curve (change in quantity demanded). A change in demand (increase or decrease) is a shift of the entire demand curve caused by non-price factors (income, tastes, price of substitutes/complements, expectations, etc.).
- Law of supply: describes a direct relationship between price and quantity supplied (higher price → higher quantity supplied), not applicable here.

2. Step-by-step reasoning
- The problem states price of cinema tickets rises.
- Observed outcome: fewer people go to the cinema (quantity demanded falls).
- This pattern (price up → quantity demanded down) matches the law of demand: movement along the demand curve in response to a price change.

3. Calculations / intermediate steps
- No numerical calculation is required. The logical intermediate step is identifying the causal link: price change (input) → movement along demand curve → change in quantity demanded (output).

4. Why the correct answer is correct
- Option b (“The law of demand”) explicitly refers to the inverse relationship just described. Since the situation describes higher price causing fewer tickets sold, it is a textbook example of the law of demand.

5. Why the other options are incorrect
- a. “A demand increases.” This implies a rightward shift of the demand curve (more demanded at every price), which is the opposite of what’s described; here quantity demanded falls because price increased, not because demand increased.
- c. “A supply increases.” That would mean suppliers are willing to sell more at each price (shift right of supply); irrelevant to the scenario where consumers buy less after a price rise.
- d. “The law of supply.” The law of supply predicts higher price leads to greater quantity supplied, not fewer consumers attending; it does not explain the observed decrease in attendance.

6. Conclusion
The described situation is an example of the law of demand; therefore the correct choice is b. The law of demand.

If the price of cinema tickets rises, and fewer people go to the cinema, this is an example of:单项选择题

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