Investors are going loco for CoCos

In a distant and forgotten era, around eight months ago, tremors were rippling through the global banking system. Three mid-sized American lenders collapsed in a week. In Europe the venerable Credit Suisse almost went under, before being bought by its rival, UBS. The scramble to merge them threw a cloud over an entire class of bank debt, $1trn of which has been issued over the past decade.