Montecfo
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
I don't really view share as the measure of principal, except only that the number of shares define the principal via their price.
To me, dividend dollars are paid are a result of the number of shares, not the share price. The principal's (shares) price goes up and down, but -- generally -- the dividends (income) stay the same as a result of the number of shares regardless of price.
[After thinking about it....]
Maybe the flaw in my thinking is that I don't view my starting balance (20 years ago) as my "principal" but my most recent balance, as defined as shares X price. Maybe if I viewed my "never touch the principal" from my original starting balance/number of shares, I'd see things more clearly (??) Have I been talking/listening past you-all all this time?
Am I having a breakthrough right in front of your eyes or am I getting further out in the weeds?!
I think you were just analyzing your thinking. Seems very healthy to me.
If your investment portfolio were in a single bond then that bond would have a principal equal to what you bought it for, It seems to me.
But you could also decide that what you think of as the principal should be inflation-adjusted every year.
I guess something to ask is what's the purpose behind your thinking regarding principal and the return on principal?
My withdrawal rate is less than my dividends and interest. But I don't view that I'm "living on the dividends and interest" since I'm willing to sell shares as needed based on my withdrawal strategy.