I don’t usually do hypotheticals, but I’ve been watching a fair amount of TV westerns lately and I thought it might be an interesting topic. Sometimes when I hear the price of something on a period show I check it against an online inflation calculator to see if they were actually in the ballpark.
So the cost of things like basic commodities, horses, cattle, land, etc. seems to be much less than they would cost today, but I understand basic concepts like inflation indexes and cost of living. I know that in modern times our buying power and standard of living is in many ways much better than in past days for commodities like food and clothing. Other things are much more expensive compared to earning power in the olden days. For example, I doubt many doctors take chickens in payment anymore. But then, you get what you pay for.
The online inflation calculator I found only goes back to 1913, and says $1 then = $26 today. So for late 1800s let’s say $1 = $30 just for a round number. What form of currency or valuable could a time traveler to the late 1800s take with them to exploit that differential, and not only be able to support oneself but be well off?
Gold, I believe, has significantly outstripped inflation in value over the years, so that’s probably not a good choice. Other precious minerals like silver are probably similar.
The best idea I could think of off the top of my head would be to obtain a vintage bill or banknote and counterfeit it until you could make it rain, old-time style. I doubt anti-counterfeit measures and detection were very sophisticated back then. Or do the same with vintage stock share certificates, but those would have separate records somewhere that could be cross-checked, I imagine.
Then, of course, once you have your stake you could take advantage of your knowledge of the future to get even richer, like invest in Comstock Lode mines before they hit it big.