Freeing trade in goods could boost global incomes by $461 billion by 2015, says the World Bank. Trade liberalization has cost sub-Saharan Africa $272 billion over the past 20 years, retorts the advocacy group Christian Aid. The debate over opening world markets, it seems, only goes to prove that there are lies, damned lies and statistics. Yet peering through the fog of numbers, even free trade advocates at the World Bank acknowledge that the gains to be made from a successful conclusion to the World Trade Organization's Doha round of liberalization talks would be relatively modest. If all tariffs, subsidies...