Hello all. I have been thinking a lot about alternative economic systems and have two hypothetical questions.
OP's question is quite interesting
People tends to believe that the currency's value is relatively stable (They use it as a standard unit to measure value, they don't like the value of the unit itself fluctuate, a currency with floating value will make average people's decision making very difficult, they would prefer the value of the currency to be a constant)
Following this thought, you will see that the "deflation spiral" is true: When people are hoarding coins more and more, less and less coins will be used on trading. To merchants, less coins means less sale, thus they will scale down the production, laying off workers, and workers get less income, less spending, and even less coins in circulation, a negative feedback loop until almost every spending are cut to minimum
So the solution is that people must get rid of the idea that currency's value is constant. If merchants understand that currency's value is floating depends on supply and demand, they would cut the product price, and cut the income for his employees when currency becomes scarce. Theoretically, if currency supply reduced by half, then everything's price inclusive salary would be cut by half, to make the whole economy work as usual. But I'm afraid that this approach will result in the resistance from workers, they don't understand that currency's value is constantly changing. Another problem is that all the merchant must do this at the same time to make it work, and typically they are limited by the lowest wage regulations
If everyone accept this, then just like Forex market, this trend will not continue forever, because everyone are facing the same decision making difficulty like a currency trader: Sooner or later, majority of whales who holding the currency will consider current product price is too low, they will spend their money to buy, then the trend will turn and the price of everything will rise up again. After a while the market will reach a new equilibrium around a new price level
In fact that is market based currency valuation, should be the most efficient way for economy. Today's system is trying to fix the value of currency, then the value fluctuation is absorbed by FED changing money supply constantly. During normal time, FED does nothing, there is no big difference, but overtime, their influence on market accumulated, and eventually will cause a large volatility, and then they will gain a lot from its operation, they just printed 5x money for themselves because people did not want USD's value to rise a lot when the market said it should
Another possibility is: When merchants are running out of currencies, they would issue their own currencies/certificates to carry out the trade (backed by each merchant). With multiple transaction medium running parallel, the effect of each currency is less predictable