I meant aggressively in the sense of well-diversified and stock-heavy (hence the "long-term" bit). If they got rich off of bond interest, well, it wasn't investment acumen that explains their success, but a) raw earning power, and b) not spending it all.
"Assume a high income" is not all that helpful.
Unfortunately, exactly what they invested in wasn't something I was very sensitive to, and I don't remember it.
Generally, they had fairly ordinary incomes, and they invested in things which were considered low-risk at the time. A fair number of them had real estate in the sense of owning car dealerships (used car lots?), with the land under the business being a large part of their wealth.
They disliked spending money. It was common for them to be men whose wives made a full-time job of running the household cheaply. (There was a later book called The Millionaire Woman Next Door.)
The question that the ideas are supposed to be in response to is:
Here are links to some proposed ideas that you should vote for, assuming you agree with them. You do have to register to vote, but the email confirmation arrives right away and it shouldn't take much more than two minutes of your time altogether. Why should you do this? The top voted ideas from this request for ideas will be seen by some of the top policy recommendation makers in the USA. They probably won't do anything like immediately convene a presidential panel on AGI, but we are letting them know that these things are really important.
Research the primary cause of degenerative diseases: aging / biological senescence
Explore proposals for sustaining the economy despite ubiquitous automation
Establish a Permanent Panel or Program to Address Global Catastrophic Risks, Including AGI
Does anyone have any other ideas? Feel free to submit them directly to ideascale, but it may be a better idea to first post them in the comments of this post for discussion.