- Residential districts in China and many former Soviet countries. Big concrete blocks, with the bottom floor lined with small stores. They're absolutely delightful places to live.
- Urban residential districts in the US aren't quite in this style, but a city like Cambridge will have small shops within walking distances of virtually all housing.
The critical thing is that the shops are a lot more pleasant and human than US business districts. A massive lunch hour line at some overpriced (probably due to high-rent and long lines everywhere) sandwich place isn't very human. A small business run by the owner is. One of the differences is that in residential settings, business owners and residents are part of a community -- they get to know each other, sometimes for decades. Business districts have people moving in and out too frequently for that.
"Peak density" is also a lot worse than "mean density." Both a customer and a business owner is better served with traffic spread out throughout the day, rather than nearly 100% of business crammed in during breakfast and lunch hour.