THE leaders of developing countries on Tuesday began the final day of a summit expected to end in appeals to rich nations for more aid and a bigger share of world trade. The G-15, which comprises 19 countries from Asia, African and Latin America, has blamed the West for reducing member states to penury by crippling debts and unfair trade terms. Member states have also slammed the way World Trade Organisation trade rules are working out, saying their fragile economies are at risk.