I deal with one of these 'killer problems' every day. Hard money, aka inflation, is a very important economic problem.

For example, inflation forces market participant behaviour that they would have otherwise avoided. For example, a pensioner is 'forced' to take on market risk to gain a real return on their savings when they are very risk adverse.

Savers are disincentivized as there is a negative yield on their capital, and this has an impact on capital investment.