on why a shift in reserve currency matters

Question

I understand that the USD has become the defacto reserve and trade currency in the world post WW2, and that people put importance in this fact.
Isnt any currency traded therefore establishing values and liquidity, thus it doesnt really matter in what currency trade or reserves are undertaken?

In: 2

Answer 1

As the reserve currency, the US government gets some extra benefits such as being able to borrow at low interest rates because it’s seen as a safe investment and being less susceptible to runs on the currency.