Again you’ve got some challenging requests. I’m not sure I’ve seen any empirical studies focusing on that hypothesis, but you can probably find writeups and mentions of some in LvMI literature.
Navigate to mises.org and run a search for “austerity” and see what you find.
! Really specific requests. Again I would think the best place to start is that search above. Murphy has written quite a bit on Krugman so you may find a link or mention to the Krugman work in question. (You might also run a search on Murphy’s blog.)
Again, see above. Also, which video is it you’re talking about?