You are changing the subject again.
You asked about a single stock for life. My response is that it is basically impossible to pick one ahead of time that will make you rich - if you want guarantees you need to pick many. If you just pick one you might be picking today's RCA.
Of course, it's easy to pick one in hindsight. Look at the Nifty Fifty.
If you'd bought the entire lot you would've done ok. If you'd plunged into just one, like Eastman or Simplicity Pattern (not a firm on most people's minds today) you would be screwed.
Don't pick one, pick many. Amateur.