Ravi says whichever country is the most powerful must have the best system of government…

Why

Ravi is assuming that a country's power must be a scorecard for its government — the stronger the country, the better the system must be. But a country's power depends on many things that have nothing to do with how it is governed: how large it is, how many people it has, what natural resources sit under its land, its geography, and centuries of history including conquest and colonies. Through history, countries with very different systems — kingdoms, empires, one-party states, democracies — have all been powerful at different times. Test it: think of two countries with similar systems of government, one rich and strong and one poor and weak — the difference is usually resources and history, not the system. His teacher is right: power comes from size, resources, and history, not from having the 'best' system — a strong country is not proof of good governance.