> Most businesses don’t even accept cash anymore.

Really? I've been using cash almost exclusively for the past several months and haven't had any real problems. Sure, the overpriced hipster vegan Thai place in the McMall district may not take cash, but the family-owned ramen restaurant a couple miles down the road is more than happy to do so. Personally I find the "won't take cash" attribute to be a strong indicator that the business isn't worth supporting.