Which goods have a positive cross-price elasticity?

Shortage goods refer to items that are not available in sufficient quantities at a given price, leading to excess demand. The concept of cross-price elasticity primarily applies to how the quantity demanded of one good changes in response to the price change of another good, which is not directly relevant to the notion of shortages. Thus, shortage goods do not inherently possess a defined cross-price elasticity.

Normal goods are those for which demand increases as consumer income rises. While they may exhibit own-price elasticity, they do not specifically relate to cross-price elasticity, which measures the relationship between two different goods. Therefore, normal goods cannot be classified based on their response to changes in the price of another good.

Complement goods are those that are consumed together, such that an increase in the price of one good typically leads to a decrease in the quantity demanded of the other. This results in a negative cross-price elasticity, contrasting with substitutes, which have a positive relationship. Therefore, complements cannot be considered as having a positive cross-price elasticity.