There's definitely a strong psychological component to inflation. And an inflationary mindset is probably needed for hyperinflation to materialize.

But I think increasing money supply is a necessary component for hyperinflation as well.

At least, in all modern examples of hyperinflation I've reviewed, there has always been a component of monetizing the debt/deficit.

Are there examples of hyperinflation where the money supply was largely fixed? I would be very curious/interested in that.