The Deflation Boogeyman

Here we go again.  A plunge in oil prices has spurred a bevy of articles from the bought-and-paid-for media, as well as quasi-governmental agencies, alerting us of pending disaster if deflation were allowed to make an entrance, however briefly. Never mind that there is no theoretical or empirical evidence to justify this fear of deflation. (explanation here) According to the St. Louis Fed:
“While the idea of lower prices may sound attractive, deflation is a real concern for several reasons. Deflation discourages spending and investment because consumers, expecting prices to fall further, delay purchases, preferring instead to save and wait for even lower prices. Decreased spending, in turn, lowers company sales and profits, which eventually increases unemployment.”