[Youngian]

He veers between a state regulated market and pragmatic decriminalisation on drugs, they're different approaches. His defence and foreign policy approaches are just as muddled.
Neither does Zack appear steeped in green economics (as personfied by E F Schumacher) but muscular fairly mainstream Keynesianism. Always like to inform Zack's left supporters that Keynes was a member of the Liberal Party.

[Tubby Isaacs]

He's not just a particularly hubristic Keynsian. He's anything that sounds like it means he can spend a lot without raising taxes. He's MMT as well.

It's nonsense. Hopefully James Meadway can knock some sense into him.

[Youngian]

As I understand MMT its spend and tax. Taxation is raised as a method of halting rising inflation. According to advocates who are lousy at politics even if the economic theory is plausible. It is a kind of round the houses deficit spending.