there's already a vast oversupply of investment money chasing far too few opportunities: take a look at the s&p500, it's only returning 1.3% dividends. that tells you PE ratios are through the roof and that there's too much capital chasing too few opportunities. so, there's no need to "encourage investment and spending".

Society would have a lot to gain from a government that didn't default on it's obligation of "money as a store of value". there's a large need for store of value, especially with the aging population.

Money is most emphatically not a store of value and hasn't been in over 100 years nor do you want it to be. Hoarded money has little value to an economy. What you want money to do is be used to build or expand manufacturing, build or expand shipping infrastructure, communications infrastructure, expand agriculture, and so forth and so on. "Investment" is a much broader term than just buying equities. Do something with your money! As I said, there's even a parable about this.