Fixed monetary supply might be one thing in theory, but fixed credit supply is the death knell to an economy. And the two are usually complimentary. Monetary supply can fill in the potholes of weakening credit supply when the latter contracts - and it inevitably will when the private issuers that generate those debt contracts pull back in a recession. If you have your hands tied to some constrained supply like gold or bitcoin, like what happened to the central banks after World War I and into the Great Depression, you end up backed up against a wall.
That said there is certainly something that's personally appealing about an asset that's guaranteed to maintain the supply side of the equilibrium. As an investor you only have to consider demand. But for any kind of widely used currency that backs an economy it's going to be problematic.
It's appealing because it keeps politicians honest, but if you have honest politicians it is just a thought experiment.
The last 60 years on a macro level have largely proved the Keynesian model. I think we're right to put faith in politicians in general. The solution might just be holding currency from another nation instead of your own.
I think a constrained monetary supply just means the politicians we elect have less influence over the economy than the people with the most wealth. In either scenario, there will be untrustworthy politicians who need to be out voted or voted out.
Newer cryptocurrencies have more sophisticated governance structures than Bitcoin (see: Tezos). Some of them could allow for an elastic monetary supply. The downside of these systems is that it takes a lot of work to properly encode the specific set of rules which decide when to increase the supply, and how to distribute the new supply. The upside is that these rules actually exist and are unambiguous.
I am mostly talking about Europe. The Eurozone basically makes fiscal stimulus impractical even though keeping it alive absolutely requires it.
Every time I hear people talk about Keynesian economics ruining everything I am thinking "no such thing happened". QE fills bank reserves, interest rates drop on their own, banks never lend out money, stock market goes up without any actual investment, there is unemployment caused by the macroeconomic structure of the economy, investors are flooding governments with their money by buying bonds, inflation remains stubbornly low, trump cuts corporate taxes.
The fact that things are reversing in the US is a good sign for the US economy as a whole. Biden is actually doing the fiscal stimulus that the economy was asking for decades. There may be a short term crash in the future but it's only going to get rid of the unproductive part of the economy to make everything ready for more long term growth.
Meanwhile Europe will be stuck forever if the Eurozone doesn't resolve its structural problems.
This just isn't an accurate portrayal of any of the serious criticisms of Keynesian economics.
>It got us out of the Great Recession and it’s been 12 years. Maybe the consequences haven’t fully manifest, but another Great Depression would have been guaranteed hell.
It feels like an unfair argument you're having because of course the opponents' whole argument is that the consequences haven't manifested AND that they would be far more dire than a continuation of the Great Recession / another Great Depression. As wealth gaps widen, as inflation rises, as our debt grows, it's possible to see a worse future ahead than one where we continued into a depression.
In hindsight, we all know the problems which led to the fall of various empires (Roman, Mughal, etc.) but if you lived at the time, this same argument could be made against you for sounding the alarm: "Yeah, maybe it's better to not constantly expand our Empire and rely on mercenary soldiers who have little loyalty to a place they've never even been to, but can you imagine the hell if we lost the war against the Gauls??" (forgive me if I mangled the history there).
I will take this opportunity to throw this link up: https://fredblog.stlouisfed.org/2018/11/how-expensive-is-it-...