Mainstream economic thinking may hold that Greece should stay in the euro zone, but there are those who argue that abandoning the single currency will give the cash-strapped and debt-laden country just the boost it needs. Greece's economy is so depressed, they argue, that unless it regains the competitive edge that a massive one-off currency devaluation could offer, it will remain lifeless. Until then, the idea of a euro zone exit - either by accident or design - will keep on returning. Roger Bootle, the founder of London-based markets and economic analysis group Capital Economics, won an economics prize of 250,000 ... (full story)