Now you're knocking down strawmen.

The taking by inflation does not impact investment returns that are adjusted by inflation. That's the whole point of adjusting for monetary inflation. When you take out that inflation, you are comparing the equities against all the other uses of that money that are also adjusted for inflation. The loss from inflation becomes invisible, because everyone is affected by the same amount of it. The impact can still be seen in the change of ownership, from those who held real assets and old money to those who printed and spent the new money.

The 1.5% is the increase in total productivity. It comes from every laborer on the planet using, on average, slightly better tools every year than were available the previous year. That's an estimated average over a very long period of time--about 500 years. The average worker today can produce about more of whatever it is they make than the average worker in 1500, and there are a lot more workers to do it all. The rate of productivity increase has itself been increasing, thanks to universally useful inventions like steam engines, modern steel, and computers. So in the last century, the average annual increase in productivity has been closer to 4%.

The Bank of England was founded in 1694, as the first national central bank. Others followed. But it wasn't until around 1870 that it, and other national central banks, decided that they could lend in excess of commodity reserves in response to financial crises. This expanded the monetary power of central banks. It wasn't really until Bretton Woods that they started to really break free of the gold standard (coincidentally increasing in total global supply at about 1.5% per year). Had countries remained on the gold standard, the money supply could only increase by 1.5% while national productivity was increasing at 0% to 10%. Monetary crises where the amount of new money did not match the increase in available goods and services would have become increasingly common. So they started fudging the numbers, and the Fed was the lucky one that got to issue the reserve currency, so they could cheat more than any other central bank.

This all fell apart in 1971, when Nixon ended redemption in gold. The Fed had abused its dominant position from Bretton Woods too much, and other banks were calling them on it. So Nixon gave them the finger, and told them to sit on it. Nice guy. After the gold window closed for good, central banks were now free to inflate their money supplies at a greater rate, with the only check being how fast the other central banks were inflating, rather than how fast new gold could be mined and vaulted. And not coincidentally, this is when incomes started stagnating for the middle class.

Those historical returns on investments in equities are completely orthogonal to what I am talking about. The productivity dividend should, for the most part, be distributed to those who invest in research and development, and those who buy capital goods based on new technology. So, pretty much everyone, in a wide variety of businesses, across all industries. Everybody gets x% more stuff for the same amount of work. The central banks, by inflating the money supply by y%, takes some of those gains. They are not destroying the additional production. They are taking it. That percentage is not being subtracted. It is going to a different recipient. When y equals x, everyone who works labors just as hard for the same amount of stuff, and some people get a lot of stuff for no work at all. Free lunch.

But monetary inflation is a large and unwieldy hammer. You can't fine tune it for different industries. Businesses that can gain more productivity than x% can actually come out ahead. Those that cannot find it more difficult to stay in business. Tech companies often manage to pull off greater gains.

That's all this is. The power to control the money supply is the power to take a percentage of the entire economy circulating your currency. If you believe that central banks and their bank clients do not exercise that power for their own gains, at the expense of everyone else, you are a fool.

Persistent inflation of a fiat currency monetary base puts everyone on a technology treadmill, where if you do not increase your productivity faster than everyone else, you fall off. And the whole time, the spinning wheels are powering some banker's margarita mixer.