of my lending/borrowing examples is an unstable currency that is going up or down "too quickly". "Too quickly" implies there will probably be wild reversals such as spikes and valleys.
Your rendition of the examples seems to assume that rising values will keep rising or at least stay high for the duration of the loan or that dropping values will continue to drop or will stay low for the duration of the loan.
My proffering of the examples assumes that a radical reversal is just up ahead (or at least uncertainty) which creates the classic lending freeze. At any rate, credit markets (and import/export markets) prefer a stable currency.... :)
~wobbles but doesn't fall down~