The “strength” of a currency doesn’t really have anything to do with the units it uses. For example, which is a greater distance: 20 kilometers or 14 miles? It is 14 miles even though 20 is a higher number than 14.
Similarly the units of currencies are mostly irrelevant and miss the point, you would need to talk about the average income in the countries and purchasing power parity.
Instead what is usually meant when referring to a currency as being strong is that there is a high and reliable demand for that currency. The US dollar is going to be able to be traded for valuables in the future, the US government isn’t going to collapse or cause hyperinflation of the dollar. There is going to be a demand for USD because people will need it to purchase things in the future. A weaker currency might have uncertainty attached to its stability or a limited usefulness for exchange, as there may not be many things one would need that currency to obtain.
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