"I found a row house in northeast Capitol Hill, where if I wanted to cab it home late at night from Dupont Circle, African-born taxi drivers would sometimes decline to take me (on the unarguable – at least by me with them – grounds that it was “a black area”). I have never since been able to use the word “gentrification” as a sneer: the unavoidable truth is that it’s almost invariably a good symptom."