Page "Debt" Paragraph 27

However, if the real value of a currency changes during the term of the debt, the purchasing power of the money repaid may vary considerably from that which was expected at the commencement of the loan.

So from a practical investment point of view, there is still considerable risk attached to " risk free " or " low risk " lendings.

The real value of the money may have changed due to inflation, or, in the case of a foreign investment, due to exchange rate fluctuations.