I'm not entirely sure that I get your argument here avaya. You're not denying, surely, that there is a deficit. And I gather the point of borrowing is not whether we would be able to do it, but at what cost - and that's something that does have a pretty substantial impact on the public finances.
My point is that at ZLB there is no need to focus on cuts to reduce the deficit. I'm not saying it isn't important but in the current conditions it is basically irrelevant.
Your only worry is can you fund yourself in this environment? The answer is resolutely yes. It always has been. We have never been in a situation where it wasn't the case. It is actually something we will never have to worry about for a long time unless we are seriously profligate. The bond market currently has negative yields, this is not the 1970s/80s anymore when you need to be wary of the bond vigilantes. They have all gone away. Financial deregulation has vastly expanded the pool of assets they can play with, to worry about them is an irrelevance.
The focus on an accounting identity over actual rational policy is insane to me. In this situation the government is supposed to spend. It is supposed to borrow. It will fix itself. The medieval torture we have exerted on ourselves is based not on economic illiteracy but an ideological drive to use this situation to the advantage of political interests.
The focus should be on what you need to create growth. Not what you need to cut. Both the Conservatives and Labour have proposed policies which are economically illiterate. We aren't dealing in facts anymore. The media narrative is obfuscated by the idea of 'credibility' and that credibility only comes from identifying cuts to to reduce the deficit.