A more thorough explanation:

Fair play and substantial justice refer to the requirement that a court must meet in its assertion of personal jurisdiction over a nonresident defendant to comply with due process. This means that the court must ensure that the defendant's connections to the forum state are substantial enough to bring them within the court's jurisdiction without violating traditional notions of fairness and justice.

Minimum contacts refer to a nonresident defendant's connections to the forum state, such as business activity or actions that could lead to business activity. These connections must be significant enough to justify the court's exercise of personal jurisdiction over the defendant without violating the principles of fair play and substantial justice.

For example, if a company based in California sells products to customers in New York, it may be subject to personal jurisdiction in New York if it has sufficient minimum contacts with the state. This could include having a physical presence in the state, such as a store or office, or regularly conducting business with customers in the state.

A minimum-fee schedule is a list of the lowest fees that a lawyer may charge, set by a state bar association. However, these schedules are now defunct because they violated antitrust laws.

For example, if a state bar association sets a minimum fee of $500 for all lawyers, this would be considered a violation of antitrust laws because it restricts competition among lawyers and prevents them from setting their own prices based on market demand.