At the start of this I will point out that I have no interest in discussing MMT mostly because, as I have already stated, I have been around this loop a few times over the years and it always seems to get bogged down in the very loose semantics. Semantics which seem to stop it from being a useful discussion outside of academic circles and instead lead to bad natured squabbling.
In the wider public sphere we always seem to end up with it either saying not very much beyond Keynes who famously said "Anything we can do, we can afford" or saying something that mostly just serves to provided the largest possible attack surface for those we might describe using the N word.
That Keynes quote, I note, was from about 60 years ago because as is often pointed out the thing that is modern in MMT is the money not the theory and the "Magic Money Tree" is not some radical, barely supported theory but (broadly) accepted as how modern economies work for about 60 or 70 years. There are people who don't accept these ideas but invariably their bad faith basis is hidden under a wafer thin veneer.
Anyway, all I have for you is some links which I hope provide some good reading on this and the wider subject.
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First, this is a few years old now but remains a good introduction to MMT and places it in the context of the various bits of earlier economics from which it sprung and explains these in easy to understand English -- and one of MMT's biggest problems ISTM is that there is nobody who can advocate for it without either confusing everyone or making it sound like magic:
https://creditwritedowns.com/2019/03/mmt-for-dummies.html
Adam Tooze is really a historian rather than an economist, but he is an excellent read on many subjects and his views on MMT are well worth reading. As ever he will challenge your thinking and provide insight no matter what your previous views on the subject.
Here he is on Keynes and his relevance given how COVID changed everything. Like everyone he is selling his book but generally his books are worth reading.
https://adamtooze.substack.com/p/chartbook-on-shutdown-keynes-and
And here he is on Krugman when reviewing Krugman's book. He's right, of course, to be critical of Krugman although I do think Krugman is important for his public advocacy of Keynesian ideas in the wake of both the 2008 GFC and Covid.
https://www.lrb.co.uk/the-paper/v43/n08/adam-tooze/the-gatekeeper
He also did write a book on COVID which Krugman reviews here:
https://www.nybooks.com/articles/2022/03/10/covids-economic-mutations-krugman/ (soft paywall)
The reason I mention COVID and the GFC of course is because if anything resets thinking about spending and deficits and all that it's the real world experiments we have had in the face of unprecedented disasters. I note we have managed to deal with these events and before that WWII without also needing to persuade everyone to accept MMT.
And if you really want to get into the weeds, Tooze also has a fascinating article on Putin and MMT here:
https://adamtooze.substack.com/p/chartbook-91-what-if-putins-war-regime
From a leftist perspective Dissent magazine had a three part discussion on these issues here:
https://www.dissentmagazine.org/article/the-tax-trap
https://www.dissentmagazine.org/online_articles/the-mmt-trap-a-response-to-daniel-wortel-london
https://www.dissentmagazine.org/online_articles/a-reply-to-aashna-desai
Finally, an argument against MMT from James Meadway (adviser to John McDonnell) which gets, perhaps, closest to my views. He argues (broadly and in part) that the difficult part is not the economics but the politics and MMT makes the politics a lot harder for at best a marginal economic gain.
https://tribunemag.co.uk/2019/06/against-modern-monetary-theory
Again I stress none of this is meant to be me arguing a case as a much as providing some reading for anyone who wants to progress their understanding and clarify their views on these issues.