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To solve this problem, we need to calculate the cross-price elasticity of demand between Product A and Product B.

### Cross-Price Elasticity of Demand Formula
The cross-price elasticity of demand is calculated as:

\[
\text{Cross-Price Elasticity} = \frac{\text{Percentage Change in Quantity Demanded of Product B}}{\text{Percentage Change in Price of Product A}}
\]

In this problem:

- The **percentage change in price** of Product A is +20% (since there is a 20% increase in price).
- The **percentage change in quantity demanded** of Product B is 0% (since there is no change in the quantity demanded of Product B).

### Calculation
\[
\text{Cross-Price Elasticity} = \frac{0\%}{20\%} = 0
\]

### Interpretation
The cross-price elasticity is 0, which indicates that there is **no relationship** between these goods. When the price of Product A changes, it does not affect the demand for Product B.

### Answer
- The cross elasticity of these goods is: **0.0**
- The relationship between these goods is: **No relationship**

If you have more questions or need additional details, feel free to ask!

### Related Questions:
1. How is cross-price elasticity different from price elasticity of demand?
2. What does a positive cross-price elasticity indicate about the relationship between two products?
3. How would you interpret a negative cross-price elasticity value?
4. What factors can cause cross-price elasticity between two products to change over time?
5. How is cross-price elasticity used in market analysis?

### Tip:
When interpreting cross-price elasticity, always remember:
- A **positive** value indicates substitute goods.
- A **negative** value indicates complementary goods.
- A value of **zero** indicates no relationship between the goods.

If a 20% price increase for Product A causes a 10% decrease in its quantity demanded, but no change in the quantity demanded for Product B, what is the cross elasticity of these goods? Round your answer to one decimal place.

Solve a cross-price elasticity of demand problem where a 20% price increase for Product A causes no change in the quantity demanded for Product B. Learn how to calculate the cross-price elasticity using key economics concepts and formulas. Suitable for students in Grades 11-12 and undergraduate economics courses.

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