Inflation is good because it incentivizes people to spend money on things of real value (creating valuable goods and services, possibly durable goods for storage) instead of everyone sitting on cash for decades, being non-productive, and then trying to pay each other for---nothing, because there is nothing to buy.
Over time, there is always going to be some level of inflation, if there is more money than value. A stable annual rate (US Fed targets 2%/yr) is better than 0,0,0,0,100%,1000%.
Inflation is good. Too much inflation is bad. Not because of inflation per se, but because of what inflation measures.
Inflation comes from a imbalance in supply and demand. If demand in an economy is growing in a healthy way, you'll have some inflation as investments in production will take time to result in increased production.
This increase in prices serve as signaling to determine where to invest in capacity.
Prices is how agents communicate in open markets, a slight inflation is a message that there is unmet demand.
Some degree of inflation is a really good thing for the health of an economy, as is the ability of central banks to create money as stimulus in hard times.
We need inflation because it's governments' only way to keep spending like crazy, at the expense of cash holders, who are often poor, and benefiting assets holders.
We can eat some inflation, and it's worth remembering that the developed world has trouble with underinflation these days, so adding inflation isn't a negative in the short term.
Some inflation is seen as good by economists because it pushes money that would sit on the sidelines into "productive" uses. It creates an incentive and a need for risk taking or stored wealth will be eaten away. That this doesn't align with most individual's goal is of no concern to those most interested in productivity and GDP growth.
Why would small inflation be good for anyone bar the centtal bank? Small inflation is ignored by everyone.
If there was no artificial inflation (central bank racket) you could ignore it as well.
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