
The main point is this chart. This is my personal salary history. The blue line is "nominal", i.e. number of dollars; the green line is the consumer price index (CPI-U), the usual measure of inflation. The black line is my "real" salary, i.e. corrected for inflation and measured in year-2007 dollars. I think it's typical, but don't know. I'd love it if other Bogleheads would post similar charts. (I've had a successful but by no means stellar high-tech career).
This is a personal view from an early baby boomer who lived through the double-digit inflation of the seventies.
During my lifetime, in the United States, from a long-term planning and retirement-savings point of view, inflation has been no big deal.
A nuisance, yes. Uncomfortable and disconcerting, yes. Inflation, or rather changes in inflation, introduce uncertainty and risk in everything and makes planning difficult. It creates both winners and losers, and hits some people worse than others. You realize that past financial moves didn't prepare for it, and look like goofs in hindsight. But of course there is the potential for accidental wins as well (e.g. in my case, buying a house with a fixed-rate mortgage in 1976).
If you squint at the chart, the main takeaway is that my real salary pretty much kept pace with inflation. The only sustained downtrend was since 2000.
And by and large other investments keep up with inflation, too, in a very rough squint-at-the-chart-from-a-distance way. It doesn't feel like it if you're locked into a pre-inflation certificate of deposit, say. It can take years for the adjustments to happen, but, yeah, if inflation increases, eventually bank interest rates increase, bond coupons increase, and salaries increase. Eventually.
While stocks, of course (irony ahead) always earn a steady 7% real. (But seriously, apart from the Crash of 2008, about the worst period during my lifetime was 1965-1982, which was about zero real returns for stocks but not an actual loss).
So it seems to me that while you're earning and accumulating, even if you do nothing particular at all to hedge against inflation, it will probably pretty much take care of itself in the long run.
I'd guess the serious concerns really only come up in retirement, if too much of your income comes from sources that pay fixed dollar amounts.
Again, I'm not talking about hyperinflation, which is one kind of total breakdown of the economy. There is always scare talk, and it may be justified, from people who think the untrustworthy, incompetent, venal government is gross mismanaging the monetary system and a blowup is inevitable. But I regard that as a "black swan" that can't be prepared for. Blowups do happen, but the problem is that scare talk is continuous.