Cheaper cities? Economist index shows cost of urban life is going down

City links: A worldwide cost of living index, a failed 'smart' bus service and a new gentrification podcast all feature in this week's pick of the best city stories

This week's round-up of city stories takes you from Singapore to New York via Helsinki. We'd love to hear your responses to these stories, and any others you've read recently: share your thoughts in the comments below.

Related: Helsinki's ambitious plan to make car ownership pointless in 10 years