Answer:
e. air-travel and weed killer
Explanation:
Cross price elasticity of demand measures the responsiveness of quantity demanded of good A to changes in price of good B.
If the cross price elasticity is zero, there is no relationship between the pair of goods
If cross price elasticity of demand is positive, it means that the goods are substitute goods.
The cross price elasticity of beef and pork and a laptop computer and a desktop computer should be positive
If the cross-price elasticity is negative, it means that the goods are complementary goods . The cross price elasticity of an iPhones and earbuds should be negative
