Income segregation in cities: A reflection on the gap between concept and measurement

On a recent commentary on  Jean‑Michel Floch’s article “Standards of living and segregation in twelve French metropolises” I propose that

• While income segregation and the segregation of poverty are wrongly assumed to be the same in the public debate, the segregation of affluence remains insufficiently debated
• There is no benchmark for establishing how much segregation is “too much” segregation, especially in large cities in developed countries
• Although segregation is often related to being far from “where things happen”,
  segregation indicators do not measure the level of physical disconnection between
  income groups, or inequalities in provision between poor and affluent areas