Jesus... if that ain't capitalism I don't know what is. Though I am impressed the Empire managed to hold itself together through that kind of contraction.When the depression ends is uncertain, but the most common end date is 1660.
Though this adversion to big financial interests is probably one of those reasons why the Romans end up as a more middle rate power in the future. Outside investment is very important to in anything analogous to the modern day and if they're making it hard to invest and speculate even domestically I can only imagine what it's like for foreigners.
Xenophobia is in Greek for a reason.