but why do you think the presence of inflationary currencies encourages more investment (in, say, the stock market) than there would be without their existence as an option? i just don't follow the logic.
think of dollars as providing a convenient payments system in the united states (and a few other places) in exchange for the possibility of inflation, physical damage, and loss of value through counterfeit. why does that option as a store of value, however imperfect it is, encourage investment that would otherwise not be undertaken?
nothing forces the dollar's use as a long-term store of value. exactly the same thing is true of bitcoin.
It's simple math to figure out why an inflationary currency encourages more investment than a deflationary currency.
Think of it this way. Assume the real estate market is doing well, and land value grows at a rate of 10% per year. Also assume that we have a highly inflationary dollar, which inflates at a rate of 100% per year.
I have $100,000, with which I purchase a piece of land on January 1st, 2011. At Dec 31st, 2011, the value of the land, in Jan 1st dollars, would be $110,000. But since the dollar inflated 100% during the course of the year, my land is now worth $220,000. Assuming I had held the money, I would still only have $100,000 at Dec 31st, and could now buy much less land than I could at the beginning of the year. This is why an inflationary currency encourages investment - because asset values can match inflation rates, causing the asset holder to gain money.
Now think of a second example. I have purchased the same land at the same price, and land values are still rising at 10% per year, but the currency DEFLATES at a rate of -50% per year.
At Dec 31st, the value of the land, in Jan 1st dollars, would be $110,000. But since the dollar deflated 50% during the course of the year, my land is now worth only $55,000. Assuming I had held the money, I would still have $100,000. This is why a deflationary currency discourages investment - because asset values can match deflationary rates, causing the asset holder to lose money.