This is the final part of a two-part discussion about the consequences of a currency-issuing government exercising different bond-issuing options. The basic Modern Monetary Theory (MMT) position is for the currency-issuing government to abandon the unnecessary practice of issuing debt (which is a hangover from the fixed exchange rate, gold standard days). Currency-issuing governments should use that capacity to advance general well-being and providing corporate welfare to underpin and reduce the risk of speculative behaviour in the financial markets does not serve any valid purpose. However, when we introduce real world layers (politics, etc) we realise that some pure MMT-type options are not possible. This question introduces just such a case in Japan. Given the political constraints, we are asked to choose between two options for central bank conduct, when the government does issue debt: (A) Buy it all up in the secondary bond markets. (B) Leave it in the non-government sector. In this final part, I go through some of the considerations that might influence that choice.