“Today's hypothetical 18 year old doesn't want $10 million as a nominal amount. He wants 10 million present day dollars worth of value.”
This may or may not be true. OP was referring to a historical document that called out $1M and they remarked that today more like $10M is needed.
For practical purposes I guess it depends on whose hypothetical 18 year old.
If inflation is 2.5% then you need $3M in 2063 to have the purchasing power of $1M now.
Having a million bucks in purchasing power at retirement is pretty good.
So how much do you think an 18 year old wants?
I didn’t mean that taxes don’t matter at all. It depends on what you want to measure.
I was trying to show that it’s possible to end up with $10M after 45 years. I think you’re arguing that taxes will reduce that value and inflation will reduce that value. Yes, of course, so what. Arguing over how much is enough is a bit moot (or at least we should do it in person over drinks so it has some purpose and at least we can get drunk).
For me, $10M in 2063 dollars that is worth $3.3M in 2018 dollars that gets taxed at 40% lump sum or 25% per year or whatever is perfectly suitable for comfort and for angel investing. As far as staggering sums, $15M isn’t staggering in 2018 or 2063 dollars.
And yes, of course earning 5% is a huge differance than 6% over 45 years. So is earning 7%. What’s your point? Do you have a better arbitrary number for an average 45 year return?
I think we have different points and are talking past each other. You may have a more specific need for a certain number. I just want to point out that “being rich” isn’t some elusive, unobtainable outcome.