A jurisdiction question and a merits question

A classroom civil-procedure exercise supplies a complete jurisdiction test for its simplified claim: the opposing parties must have different state citizenship and the amount in controversy must exceed 75,000 units, excluding interest and costs. The stipulated sole plaintiff is a citizen of one state, the sole defendant a citizen of another, and the good-faith contract claim is 90,000 units. No other jurisdictional defect is part of this model. The defendant argues that the claim is unlikely to succeed on its facts. Students must distinguish the supplied authority-to-hear question from ultimate liability and apply all the stated conditions. The case is an explicit exercise model, not a finding that citizenship or amount alone resolves every real federal jurisdiction issue.