You post is a non-sequitur. What the heck does "Black Friday" marketing have to do with a fundamentally deflationary currency?

Perhaps you've somehow gotten the idea that deflation means a currency is absolutely not spent in any amount under any circumstances, because the incentive is so strong that it overrides all other things that human may need or want? Because that's not at all what I said.

People who can "afford" not to decrease their cache of DeflationBux will tend to avoid doing so, unless they're getting something they believe has a better future value. They are more likely to delay non-critical purchases or arrange deals that avoid that currency.

And when that happens, the currency isn't really doing its job. You can have plenty of blood in your body, but it's a bad thing when a lot of it stops moving.

If consumers delay non critical purchases, how is that bad? More money would flow into important things in society as a result and potentially less to things that probably arent needed on society (ie Angry Birds games, or selfie sticks). Those industries might go out of business and release more resources to the important ones.

You say it isnt doing "its job"? but thats not a real reason. cigarettes arent doing its job if its stashed away and not smoked.