Things that can't go on forever... don't.
Psychiatrist to patient: Maybe you don't have a complex. Maybe you are inferior.
Consumer: A person who is capable of choosing a president but incapable of choosing a bicycle without help from a government agency.
Whatever may be the distribution of uncertainty among economists, the public only gets to hear from those who have certain opinions.
If a thing can't go on forever, it will eventually stop.
If something cannot go on for ever, it will stop