Modern Monetary Theory is an alternative to Neo-Liberalism, which is Austrian-School economics in disguise.

https://en.wikipedia.org/wiki/Neoliberalism#traditions

The Thirdway was a step to the right, and a dropping of Socialist values. Modern Monetary Theory keeps what's progressive, points out that inflation is the only constraint of spending in a sovereign fiat currency and does it all through historical facts and rigor.

https://www.youtube.com/watch?v=E5JTn7GS4oA

I find it far more impressive than the pure-theory based economic schools. The common misconception is that MMT pushes for unconstrained spending when it's in fact very clear about what causes inflation.