When I was in London recently, I caught up with my good friend Carlos García Hernández, who is a Spanish radical and has a book publishing business – Lola Books – in Berlin, which publishes in English, German, Spanish and Italian. He gave me a copy of his own recently published book (2023) – Fiat Socialism – to read on the way home. It carries the sub-title ‘Achieving the goals of socialism through modern monetary theory’. I promised him that I would write some comments about it once I had taken it all in, even though I had read and sent him comments on earlier drafts. So today that is what I am going to do. At the outset, it is an important book because it addresses many of the misconceptions that Marxists and socialist-leaning people have regularly demonstrated about Modern Monetary Theory (MMT). I am in accord with much of the content but depart critically from his endorsement of nuclear energy as a solution to the climate crisis.