Earlier this month, The Atlantic, one of the best public policy sites, published an interesting piece by Eric Liu about Seattle’s decision to introduce a $15 an hour minimum wage. This is an important development for a number of reasons. Firstly, it underscores the argument advanced by Bruce Katz, Benjamin Barber and others, that American cities are stepping into the public policy vacuum left by a Federal Government that can’t make anything happen. This is a proposition that is by no means limited to the US. Here in Britain, we are also living through an era of weak executive government. The next election looks unlikely to deliver a government with a large working majority and the combination of UKIP, Scottish independence and massive voter disengagement looks set to further undermine the centre’s authority.