Slate offers up an interesting take on the recent sale of Bank One to JP Morgan Chase. Instead of moaning about the loss of another big-time Chicago instition, we should focus on the positives: our highly diversified economy, with a mix of manufacturing and services, more closely resembles the economic makeup of the country than do cities like New York or San Francisco. In addition, over the last several years, we have performed better and more steadily than cities that rely disproportionately on particular sectors, like New York or San Francisco.