Eurozone leaders, the International Monetary Fund and the European Central Bank have pressed the big red button marked "do not press" with a nearly $1 trillion (€788bn) package of loans, guarantees, swaps and outright bond purchases. Will it work?

The "shock and awe" strategy triggered a huge immediate relief rally, but key questions remain unanswered and ultimate success isn't assured. In any case, it represents a huge political gamble to restore confidence to markets, and it will have profound consequences.