I can't dispute the author's concession that falling 90% against the dollar in a short period of time is a sign of an unstable currency. On the other hand, I m

I can't dispute the author's concession that falling 90% against the dollar in a short period of time is a sign of an unstable currency. On the other hand, I most heartily dispute the author's assertion that rising 90% against the dollar in a month is a sign of a stable currency.