Deirdre McMurdy

Another Halloween has passed and we're all still feeling a little bit jittery after a week of gorging on two-bite chocolate bars and mini bags of Doritos. Or maybe it's the time change that's got everyone slightly out of synch.

In any case, the fundamental weirdness of this autumn ritual — which seems to gather more steam every year — is inescapable: It's a celebration of zombies, ghosts, spiders and death combined with candy and kids. And it says a lot about how much some humans love being terrified.

It's the same dynamic that prompts us to spend all kinds of money to scare ourselves sick on roller coasters and at slasher movies. And it's the same contradiction that underpins a big chunk of our economy.

How else do you explain the celebrity status of pundits like Nouriel Roubini, Tad Homer-Dixon and Jeff Rubin who've built their careers on predicting that the worst is always yet to come.

Think about it: RRSPs, insurance, fitness, automotive, media — all of these sectors of the economy market fear along with their basic menu of goods and services.

Whether it's extra insurance, new and improved safety features, or health club memberships, anxiety is a powerful consumer engine. The more dire the scenario the more we spend — and there's nothing quite like bad news to sell newspapers and attract eyeballs.

* Related: What SARS taught us about health scares and money

Stock markets shimmy between fear and greed and when one gets too far ahead, the other kicks in to correct it. There'd be no politics at all if you couldn't whip up a good frenzy about what the other guy would do if he were in charge. (Think of Liberal leader Michael Ignatieff's comments on the "once-in-a-generation" economic crisis and the "worst economic crisis since the Great Depression.")

Then there is our chronic vulnerability to health scares. Anyone who doubts our willingness to succumb to talk about pandemics doesn't have to look any further than the most recent panic about H1N1.

In the first wave of panic, even before anyone knew much about it, the "swine flu" label devastated pork producers. It has escalated steadily from there.

Related gallery: Profiting from H1N1