[yummyfajitas]

Clearly you think that if a model works well in a high trust community full of high intelligence high conscientiousness people who've spent $20k/year to be there, it'll work for Walmart.

I know of a hippy commune (upper middle class, mid 50's, entirely white/asian, yoga/meditation/etc types) that lets you operate the store cash register yourself. Admittedly the store is not as extensive at walmart, it mostly just sells organic vegan flax seed cookies. If you don't have enough cash you can just pay them tomorrow. So why can't walmart just adopt that model?

(I know, I'm hinting at the naughty and unspeakable idea that walmart shoppers are bad people who steal and commit other crimes.)