Suppose that the quantity demanded (*QD*) and the quantity supplied (*QS*) in the market for apple under certain price levels are listed in the table below.

**[ Price ($) ]** 

 **[ *QD* (kg) ]** 

  **[ *QS* (kg) ]**  

5

2868

5815

4

3300

5800

3

4300

4300

2

5200

3150

1

6000

2900

Suppose the demand curve is non-increasing and the supply curve non-decreasing.  When the price is $6, there will be an excess supply of at least **[Answer]** kgs of apple.

(In decimal numbers, with two decimal places, please.)

To solve this problem, we need to determine the **excess supply** when the price is $6.

### Definitions:
- **Excess Supply** occurs when the quantity supplied ($ QS $) exceeds the quantity demanded ($ QD $) at a particular price.
- From the table, we know the quantities demanded and supplied for various price points, but the price of $6 is not explicitly given.

### Assumptions:
- The demand curve is non-increasing (as price increases, quantity demanded decreases).
- The supply curve is non-decreasing (as price increases, quantity supplied increases).

### Approach:
Since the price is increasing from $5 to $6, we can assume that:
- **Quantity demanded ($ QD $)** at $6 will be less than or equal to $ QD $ at $5.
  - $ QD $ at $5 is **2868** kg. So, $ QD \leq 2868 $ kg at $6.
- **Quantity supplied ($ QS $)** at $6 will be greater than or equal to $ QS $ at $5.
  - $ QS $ at $5 is **5815** kg. So, $ QS \geq 5815 $ kg at $6.

### Conclusion:
At the price of $6:
- **Maximum $ QD $** at $6 is $ 2868 $ kg.
- **Minimum $ QS $** at $6 is $ 5815 $ kg.

Thus, the **excess supply** at $6 is at least:

\[
\text{Excess Supply} = QS - QD = 5815 - 2868 = 2947 \text{ kg}.
\]

Therefore, the excess supply is **2947.00 kg**.

---

Would you like further clarification or details? Here are some related questions for deeper understanding:

1. How do demand and supply curves behave generally?
2. How would excess demand be calculated if $ QD > QS $?
3. How would a market equilibrium price be determined in this context?
4. What are the effects of excess supply on price adjustments?
5. How can this supply and demand analysis apply to other products?

**Tip:** In a free market, prices tend to adjust to balance supply and demand, eliminating excess supply or demand over time.

Suppose that the quantity demanded (QD) and the quantity supplied (QS) in the market for apple under certain price levels are listed in the table below.

[Price ($)] [QD (kg)] [QS (kg)]
5 2868 5815
4 3300 5800
3 4300 4300
2 5200 3150
1 6000 2900

Suppose the demand curve is non-increasing and the supply curve non-decreasing. When the price is $6, there will be an excess supply of at least [Answer] kgs of apple.

Determine the excess supply of apples when the price is $6, based on supply and demand curves. Learn how to calculate excess supply with quantities of QD = 2868 kg and QS = 5815 kg, and understand the principles of non-increasing and non-decreasing functions. Suitable for Grades 9-12 students.

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