The rand has suffered a relentless beating in the market turmoil of the past few weeks. Economist Mike Schüssler says one way of stabilising the currency would be to introduce a swap line between the US Federal Reserve and SA’s Reserve Bank. We asked him what this would entail.

MS: The Bank of England, the European Central Bank (ECB), the Japanese central bank and the Swiss National Bank have permanent swap arrangements and there’s no limit, as far as I know, on them...