There has been a recent study that says that walkable cities do not make people happier. According to that study, this is because in the most walkable North American big cities such as Boston and New York City, there is a huge wage gap relative to cost of living for many of those city’s residents.
You can see where this is going already. With so many people working multiple jobs and trying to feed children, doing so at wages that are not in keeping with their financial constraints, the issue of how many walking paths, green spaces, or bike lanes in a given neighbourhood isn’t likely to make much of a dent on the happiness front in relation to those harsher realities.
My response to that, of course, is just this: duh.