To set things straight, I borrowed money from my older brother to erase my credit-card debt (I repaid him over time, without interest) and began using my cards only when I knew I could pay them in full each month.
Furthermore, Lauren Wainwright may indeed have exactly the deeper conflict of interest that Florence only hinted at and suggested by using her tweet merely as an example.
Not only does a fixed rate prevent a central bank from usinginterest rates to prevent an economy from overheating (because higher interest rates would push up the value of the currency), but it also encourages too much foreign-currency borrowing when foreign interest rates are lower than local ones.