Why no "Plan B"?
As a supporter of Scottish independence, even I sometimes get frustrated that the SNP don't explicitly say what their "Plan B" is (implicitly it's always seemed fairly clear - a currency union isn't the only way of keeping the pound).
Whatever you may think of Alex Salmond, he's not daft, so there had to be a reason for him consistently failing to give the clarification that obviously many people want. I would have guessed that it was something to do with maintaining the strength of his negotiation position after a "Yes". That wasn't a million miles off, but it wasn't wholly right. Here's Alex Salmond giving the clearest explanation I've seen of why the SNP are taking the position they are:
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And as they have no intention of X, all it does is muddy the waters and open the door to other negative campaigning.
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We may not be able to call it pre-negotiation exactly, since there's no talking, but it does seem to be a stance taken with successful negotiation very much in mind, at some risk to making the public, political case that'll establish the need for negotiation.
It must be quite a difficult stance for a politician to take, despite that political argument about the muddied waters in its favour too, and I'm glad that sort of thinking is going on. I think they should make more of a public case of that argument than they have, though.