Editorialist: Despite the importance it seems to have in our lives, money does not really exist. This is evident from the fact that all that would be needed to make money disappear would be a universal loss of belief in it. We witness this phenomenon on a small scale daily in the rises and falls of financial markets, whose fluctuations are often entirely independent of concrete causes and are the results of mere beliefs of investors. The conclusion of the editorialist's argument can be properly drawn if which one of the following is assumed? ['Whatever is true of money is true of financial markets generally.', 'If everyone believes in something, then that thing exists.', 'Only if one can have mistaken beliefs about a thing does that thing exist, strictly speaking.', 'Anything that exists would continue to exist even if everyone were to stop believing in it.']