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Answer:
In act 3, scene 1, Mercutio is unaware that Romeo has married Juliet, who happens to be the cousin of the "fiery Tybalt." When the men meet in the streets shortly after Romeo and Juliet's marriage, Romeo backs down to Tybalt, who has challenged him because of perceived insults.
Explanation:
A public good is a good that doesn't cause rivalry and doesn't exclude anyone and anyone is using it for the good of the society. An examples of a public goods might be fresh air or national security.