By , LONDON (Reuters) - Stocks gained modestly on Monday with many countries on holiday as German business morale rebounded strongly in May, offering a glimpse of optimism to battered investors of what lay beyond weeks of economic lockdowns.MSCI’s gauge of world stocks gained 0.4%, nearing a 2-1/2 month high. The pan-European STOXX 600 index was up 1.2%.Lockdown measures introduced in mid-March have put the global economy on track for a recession this year. Only unprecedented stimulus by global central banks has held up world markets in recent weeks.With nervous investors wary of adding to...…By , LONDON (Reuters) - Stocks gained modestly on Monday with many countries on holiday as German business morale rebounded strongly in May, offering a glimpse of optimism to battered investors of what lay beyond weeks of economic lockdowns.MSCI’s gauge of world stocks gained 0.4%, nearing a 2-1/2 month high. The pan-European STOXX 600 index was up 1.2%.Lockdown measures introduced in mid-March have put the global economy on track for a recession this year. Only unprecedented stimulus by global central banks has held up world markets in recent weeks.With nervous investors wary of adding to...WW…