Within currency unions, labour mobility and income transfers have been regarded as key elements for adjusting to asymmetric shocks. Generally, an economy living on a single commodity and its refining industry, and therefore exposed to cyclical fluctuations of this particular commodity, is assumed to be particularly vulnerable to asymmetric shocks.
This means for example that home regulators ask that the parent bank and each subsidiary inside the group must comply with that requirement. If not, penalties should be imposed, such as increases in capital requirements. The effect of that kind of currency mismatches could be explicitly considered in the Pilar II of the Basel II Agreement.