The withering complexity of a four-year-old global financial crisis — in the euro zone, United States or increasingly in China and across the faster-growing developing world — is now stretching the minds and patience of even the most clued-in experts and commentators. Unsurprisingly, the average householder is perplexed, increasingly anxious and keen on a simpler narrative they can rally around or rail against. It’s fast becoming a fertile environment for half-baked conspiracy theories, apocalypse preaching and no little political opportunism. And, as ever, a tempting electoral ploy is to convince the public there’s some magic national solution to problems way beyond borders.