https://www.forbes.com/sites/timworstall/2016/10/03/us-wages...
Essentially, up to the 1970s, wages followed closely with productivity. Quite suddenly, wages stopped growing while productivity has continued to grow with no sign of catching up.
Take a look at this chart from the BLS:
https://pbs.twimg.com/media/DJ9l_q6VYAERRDt.jpg
What we can take from that is while prices for certain things have declined(e.g. technology, new cars, software, toys, clothes), the price of arguably more important things (child care, medical care, college tuition, textbooks, housing, food) has gone up. Sure, we've been bearing those costs, but the maximization of profits from those expenditures will inevitably cause an adjustment when Americans can't pay for those things anymore.
Americans might technically have a higher buying power than 1900, and especially 1930, but not necessarily in every area or even the areas that are important. If we were to say that Americans have more access to food, clothing, computers, education, etc., it doesn't mean that Americans are actually paying for those things; a lot of the wealth we think we have is coming from record amounts of debt that were unseen in the early 20th century. The things that make it seem like we have more spending power than we did a century ago are being made possible by what could be a ticking time bomb.
That is, once the dollar dropped the link to gold, and money could be printed, a lot if things went increasingly haywire, down to the circus of bailouts in 2008 and "quantitative easing" afterwards.
What’s to say that currency won’t be tied back to commodities? What makes you so confident?
I think our leaders just said “why not both?”.
It’s going to be an interesting few decades.
That's plenty of time for an entire generation to be raised with an awareness that any entrepreneurial enterprise they may attempt can be crushed and consumed in short order by a competitor with the backing of the moneyed elites. If you try to manufacture a quality product in the US, and bootstrap your business, the instant you prove there is a market for it, someone will gather up some financing, knock off your product in China, and run you out of your own business. If you build a fun game app, Zynga or King or some other chop-shop with their model will instantly clone it and kill you with their marketing. If you open so much as a lemonade stand, the city will come round asking about inspections and permits.