I want to create an interplanetary empire in a single solar system. It is ruled by an Emperor and his court officials.
I want this interplanetary empire to utilize a complex economic system where each planet has its own fiat currency and is free market to an extent for each planet. On the interplanetary level, however, the Emperor creates a gold standard currency to avoid the issue of hyperinflation and other disadvantages of fiat currency. He issues an edict to make him the sole producer of minted gold coins. (the planets cannot use gold as currency, only the Emperor)
This currency is intended to be an anchor for fiat currencies. That is, it serves to have a static/stable value making it an attractive reserve currency. This may also have the benefit of giving more power to the Emperor. Wherein the Emperor allows how much of gold coins are circulated in the any given planet's economy, affecting the economic growth/decline of certain planets if they misbehave.
The reason for the Emperor utilizing a gold standard instead of just another fiat currency is more or less arbitrary. It's not intended to be a panacea to economic ailments, but something I personally wanted to be in my world. (this includes the disadvantages as well, which I'd like to explore in a story I;m currently writing)
But I would like your guys' opinion. What would the economic climate be in this scenario? Can this interplanetary economy grow or would it stagnate and ultimately fall apart? Would the economy be stable? What issues can you foresee in this gold standard/reserve currency?