Walkable Cities

Richard Florida, for The Atlantic Cities:

Then we matched the new Walk Score data for these 50 largest cities to statistics for the broader metro areas of which they are a part. As before, we found significant associations. Walkable metros had higher levels of highly educated people (a correlation of .36), higher wages (.61), higher housing values (.50), more high-tech companies (.58), greater levels of innovation (.45), and more artistic creatives (.57).

Which is cause and which is effect? I have my bet.