In the OP you raise question about how crypto would adjust to growth and contraction cycles in economy. From what I understand of your analogy to present economic cycle, this is what you have stated:
1. During growth, banks extend more credit allowing availability of currency for things like capital investment, additional wages etc.
2. During contraction, the bad loans get 'written off' resulting in money being destroyed.
I don't understand how the second point is a desirable characteristic for any currency to adopt. Aren't such cycles of credit destruction caused by the banking, politician, business nexus in the first place??
Honestly, I can't say if it is a desirable characteristic or not because I don't really know. I just point it out. The debt shouldn't necessarily get written off as it often happens in real life, though, but that's actually a technicality. If the loaning bank has a collateral, it just sells the collateral and receives the money if that was your point. But even if the loan is returned, the money still gets destroyed because this is how the whole thing about endogenous money works. Credit is money and when it is returned, the money it represents disappears.
You are right about loaning banks having collaterals, as an example, in the form of land deeds or houses when it's someone in their 20's taking an educational loan. When it comes to the real money out there, the business-men making impossible bets and banks providing them money for their mid-air castles, there are hardly any collaterals to bank on.
This mismanagement and nepotism based judgement in loaning out funds to select businesses is typical of the present system. This is made possible because we accept the point no. 2 we are discussing as an economic certainty. it necessarily needs to happen that the "poor, risk-taking. true-blood capitalist" businessman will eventually lose money when there is a downward cycle needing loan write-offs.
All I am raising a question on is in treating this as a necessity when it seems to me a corruption of the existing system. Why do we have to replicate that in crypto? I am probably not understanding the economics related point you are trying to make and I'd appreciate if you can point me to source on this.
On the face of it, the idea to justify money depletion as a method to compensate for bad loans given out by compromised banking entities seems illogical to me.
Let's talk about the first case. Lets assume that a country has its own publicly auditable cryptocurrency. It is being mined with a PoW algorithm and you can always expect to have predictable supply available to be added to the pool. This assumes that the reward hasn't trailed off to almost zero yet.
This leaves you ample scope for "planned growth". Planned as not in a planned, socialist economy but planned as in prudent planning about where to allocate the budget rather than simply allot huge amounts to schemes like today that get distributed to private contractors via a complex system of Government sub-contracts. The flow of money in such government handouts is completely obscured and unaccounted. It's as easy to write off a loan as an asset loss to accident or unforeseen incidents.
You seem to neglect the fact that you can't predict how the economy in question is going to evolve. The business cycles live on their own, and you can't pull off things like "prudent planning about where to allocate the budget". There is no "planned growth" unless we talk about a planned economy. But we all know where such planning leads.
The road to hell is paved with good intentions too.
Your question was about where the increased supply needed should come from. The amount of currency to be made available in any future period is mathematically known in case of bitcoin. I am not saying that we need planned economies.
That's the reason i insisted on "Planned as not in a planned, socialist economy ".
Planning doesn't necessarily have to mean communism. Every government has an yearly budget allocation. When you know the future money availability, you can always decide beforehand where and how to allocate funds to.