balance of payments は国際収支（経常収支＋資本収支）

https://www.imf.org/external/np/ieo/2003/cac/pdf/all.pdf

interest rate policy poses special problems in situations of “twin crises,”
in which a balance of payments crisis triggered by
capital outflows takes place simultaneously with a
banking crisis.

As Krueger (2002) put it:

“To confront a balance of payments crisis, the appropriate policy
responses entail an exchange rate change, tightening
of monetary policy, and tightened fiscal policy. To
stem a financial crisis, by contrast, entails loosening
of monetary policy, maintenance (or even appreciation)
of the nominal exchange rate, and financial restructuring.
. . . To a significant degree, in the presence
of twin crises, whatever is done to address one
will, in the short run, make the other worse.” [parentheses in original].

2%〜4%の緩やかなインフレターゲットは通常の政策の範疇だが、
国際収支が赤字で、銀行システムの危機の最中は推奨しない

日本は国際収支が黒字だが、円高に転換すれば短期間で国際収支は赤字に転落するのが濃厚だ
対外資産の積み上げも民間企業の競争力とバランスシートが一気に低下すれば一瞬で焦げ付く可能性がある