Let's work through an example. I buy 100 seeds for $1 each. I plant them, let them grow, and harvest the result. I now have 104 seeds. My real growth is 4%!
Now I want to sell the seeds back to recoup my investment. But I discover that prices have dropped by 4%: seeds now go for 96 cents apiece. My 104 seeds now are worth $99.84! I would have been better off not buying seeds at all, and instead just holding on to my money. Real output is reduced.
This illustrates how deflation inhibits growth.
Do the seeds or plants have any purpose other than the production of more seeds to eventually be sold?
In this model, seeds have no inherent depreciation, and our hero would have bought them from a seller, e.g. a storefront. In a deflationary environment, the nominal value of capital goods decreases, so anyone holding seeds, whether as inventory (the seed store) or investment (planted in the ground), would take a loss.
You are correct that, given deflationary expectations, fewer people would plant seeds. That is exactly what this scenario is meant to illustrate. Fewer people doing work is called unemployment!
And to your last question, let us say that seeds can be used as food. As seed suppliers drop out of the market, this inescapable demand for food will indeed drive their price up. Deflationary spirals do not terminate in starvation: equilibrium is reached, because of basic necessities. But the equilibrium is at a lower output level, and with higher unemployment.
It seems like the market will price seeds in a way that incentivizes optimal production.
But if you are serious, error is here: But I discover that prices have dropped by 4%
You do not simply drop prices, like that. Why did prices drop? (Price) deflation is just a descriptive name not a moving cause. (Price) deflation is not a knob which someone simple turns up and down.
Now depending on why exactly the prices did drop, and by how much you may be either in or out of luck.
In a case where monetary supply is fixed (ie gold), if you hold on to it for a period of time, you will get more goods for it than now. That 'more' will correspond to economic growth over the period. You will have the same fraction of the purchasing power pie as before, but now the pie is larger. Does not look like a win to me, but this is the judgement call for the reader.
PS. Yes, I am simplifying and ignoring some thing like velocity of money and fluctuations in economic output, and growth of capital, human resources, and technology.
A Rip van Winkle with a year savings (say clerks' job) falling asleep for a 100 years will not wake up a Rockefeller.
Yes, I'm arrogant and I'll deal with an idealized model where the same set of resources is transformed into final goods, but bear with me.
In order to get a real growth of 4% be it per year or per century in such a scenario, you need to find a better use of resources so that with the same resources you may produce an output which is 4% greater than before.
Which is the same as saying the the only way to grow is to find ways to produce final goods cheaper.
And because production is cheaper, more goods could be sold but.. entrepreneurs will still make a profit. Pretty much the same.
And the fact that final goods get cheaper means just that.. That goods get cheaper.
And you will not get rich by just holding bitcoins, or any other fixed supply money. Yes, you will be able to get more stuff for but only because the stuff get cheaper..
You'll still hold the same fraction of total purchasing power that as the day you decided to "hoard" your money for a while.
That's not what I call getting rich, and that's why loans and interest make sense and are safe with bitcoin.
P.S. Take you time. It's late in my TZ.