&quot;<i>Were interest rates negative enough for long enough, specialist security firms would emerge that would build vaults to store cash&quot;</i><p>I see this speculation from time to time, but no data to back it up. I wonder, who benefits from such rumors? To my limited understanding in economics, negative interest rate is to encourage lending vs hoarding, so while money is moving, you don&#x27;t actually &quot;lose&quot; them?