That is one odd definition of deflation.<p>Anyways, the reason deflation is worriesome is that it is downright lethal to anyone with debt.<p>Just look at the great depression and its deflationary death spiral. Companies were dropping prices to try to sell anything at all, but the debt was ratcheting up faster, and to they keeled over in droves.<p>Compared to that mild(!) inflation is preferable, at least as long as wages keep up. This because debt is rarely inflation adjusted, and thus gets easier to manage over time.<p>Note thought that the only examples of &quot;hyperinflation&quot; are more likely to have been foreign exchange related. This because in both cases you were dealing with nations with little to no exports, and massive foreign expenses.