Let's say interest rates go from 3% to 1%. Now investments need to rise their yield to 6% or they won't be funded. Some investments that were viable without deflation are no loger viable because of it.
I wanted to keep the example simple, but I'm going to rewrite it.
That's not correct. You are forgetting that those investments would have a higher return as well because a deflationary currency changes the time value of money.
What's not correct? Interest rates go down or yields have to rise?
How real capitals increase their real yield through deflation?
Deflation reduces the nominal income, so you have to reduce the proportional yield or devalue the investment.
On the other hand, proportional yields will tend to rise as competing bakeries close down due to insolvency.
And the financial and investments market have to adjust to meet that condition.
They already will have. Otherwise, that condition wouldn't exist. You can't change one assumption while keeping all the others the same, the world doesn't work that way.
I guess the tricky thing is "from one day to another you has a 5% deflation period". The destruction deflation causes, makes the remaining real capital more profitable again, allowing money to market its time value.
There won't be more investments as long as money can't profit from its time value, that evil is the nature of interest. Capital yields tend to zero by competition, but when they try to push down the interest to zero, money (demanding a minimum tax on investments) stops further competition.
Deflation would cause the scarcity that would end with itself, so I don't think that a 10 year 5% deflation period is possible within a free market.
You say loans aren't affected by deflation, because it only affects the current price of btc (1 btc = 1 rc). But when you told me how to factor deflation and interest in the current bitcoin price we got reductio ad absurdum.
You got a
reductio ad absurdum because you assumed both inflation and deflation at the same time.
Deflation simply means that more of the present value of money comes from its expected future value. But it is still worth precisely what it is worth, and that includes the present values of its future value. A borrower is borrowing the present values of those greater future values and gets to spend them, providing the notional surplus that compensates for the deflation.
Say I borrow 1 bitcoin for a year. I pay back 1 bitcoin plus some interest. You're thinking "I only borrowed 1 rc and I have to pay back 1.05 rc and that's before the interest -- unfair". But it is just as valid to think "I borrowed a bit more than the right to have 1.05 rc in a year, and I pay back precisely 1.05 rc in a year, before interest -- more than fair". I am paying back almost precisely the same thing I borrowed, plus interest of course.
And you'll note how perfectly balanced it is. The thing I'm borrowing more than I'm paying back, before interest, is the extra opportunity value of having that 1->1.05 rc for a year. And that is always precisely what the lender contributes and the thing for which he is paid interest.
I'm not saying it's unfair, just that discourages real capital accumulation.
The fact that when you borrow 1 btc it includes the right to have 1.05 rc next year, doesn't change the fact that if you invest that 1 rc today, you need to gain 1.05 rc plus interest in a year to pay back the loan.
Without deflation if you invest 1 rc now, you need to gain 1 rc plus interest in a year, which is easier.