Topic 04.10.2025

Topic 04.10.2025

от Светлана Евгеньевна Ситникова -
Количество ответов: 47

Class 5. 

Re: Topic 04.10.2025

от Ayda Baseri -

a) Jill will buy 3 pairs of shoes per year because for the 3rd pair, the marginal benefit ($30) is greater than or equal to the price ($29.99), but for the 4th pair, the marginal benefit ($20) is less than the price.


b) If the price increases to $39.99, Jill will now buy **2 pairs** of shoes per year because for the 2nd pair, the marginal benefit ($40) is still greater than the price, but for the 3rd pair, the marginal benefit ($30) is less than the new price.

Re: Topic 04.10.2025

от 心怡 (Жао Синьи) 饶 -
1️⃣a• For the 1st pair: MB = $50, Price = $29.99 → $50 ≥ $29.99 → Buy.

• For the 2nd pair: MB = $40, Price = $29.99 → $40 ≥ $29.99 → Buy.

• For the 3rd pair: MB = $30, Price = $29.99 → $30 ≥ $29.99 → Buy.

• For the 4th pair: MB = $20, Price = $29.99 → $20 < $29.99 → Do not buy.

Thus, Jill will buy 3 pairs per year.
b.• For the 1st pair: MB = $50, Price = $39.99 → $50 ≥ $39.99 → Buy.

• For the 2nd pair: MB = $40, Price = $39.99 → $40 ≥ $39.99 → Buy.

• For the 3rd pair: MB = $30, Price = $39.99 → $30 < $39.99 → Do not buy.

Thus, Jill will now buy 2 pairs per year.
2️⃣ • For the 1st pair: Joe’s MB = $50 × 2 = $100, Price = $29.99 → $100 ≥ $29.99 → Buy.

• For the 2nd pair: Joe’s MB = $40 × 2 = $80, Price = $29.99 → $80 ≥ $29.99 → Buy.

• For the 3rd pair: Joe’s MB = $30 × 2 = $60, Price = $29.99 → $60 ≥ $29.99 → Buy.

• For the 4th pair: Joe’s MB = $20 × 2 = $40, Price = $29.99 → $40 ≥ $29.99 → Buy.

• For the 5th pair: Joe’s MB = $10 × 2 = $20, Price = $29.99 → $20 < $29.99 → Do not buy.

Thus, Joe will buy 4 pairs per year.