Answer :
Answer:
The answer is Substitutes.
Explanation:
For cross-price elasticity we can either have substitute goods or compliment goods. If the cross-price elasticity is positive, then the goods are substitutes and If the cross-price elasticity is negative, then the goods are compliments.
In this example, the cross-price elasticity is 0.31. This answer is postive, meaning, beer and wine are substitutes.
So 1% increase in price of wine will make demand of beer to rise by 0.31.
It can't be complement s because it is not negative.
It can't be necessities because this does not relate to cross-price elasticity