I looked up the quote and it seems like it was fornicates though I remember it being fucks. I didn't do a ton of research to verify it though. i remember it as "if it fucks, floats or flies; rent" but I lost the book so I can't look it up easily.
so Felix Dennis is the 'Old Wise Person' refereed to elsewhere in this thread with the same quote? Or is this another one of those quotes like the ones attributed to Einstein i.e. no-one know who said it.
It was in his book "how to get rich" or something similar to that title. Half memoir half advice. It's actually a pretty good read... title notwithstanding. I am not sure if he was he originator of that saying though.
The Audible version is extremely good. The narrator makes it sound like Monty Python, which seems to be an accurate tone for the book. It isn't a parody, but it's definitely irreverent and thoroughly entertaining.
Not completely bad advice for most rich people that want to stay rich.