[Merrill]

>The new urbanisation guidelines encourage mixed-use development and recommend that all residents should have improved access to a diverse range of public and commercial amenities – schools, supermarkets, retirement centers, hospitals, parks, and cultural centers – within range of where they live. There is a special emphasis on green space: the guidelines decree that all city dwellers should have access to public parks, gardens, and other open areas.

This portrays the city as only a residential entity with residential amenities. Where are the productive uses of land, such as factories, refineries, shipyards, office buildings, warehouses, food markets, etc. that are needed for a thriving economy. "Mixed use" should account for placing places of employment in proximity to residential areas so that transportation costs and time consumed by commuting are reduced.

Or are cities to be exclusively centers of consumption?

[bobthepanda]

Mixed use employment areas don‘t really reduce commuting time, especially if you have a multiple income household where people work in different areas. Tokyo is extremely mixed use and still has long commute times.