Religious beggers are accepted part of society in Tibet. Giving money or food to a pilgrim is considered an act of merit . Donations of one yuan(Chinese currency)are appropriate .Please note: if the baggers are the old men and women who dress in shredded, bulky clothes ,while the younger ones may have a monkey on chain, it’s a spectacle of great interest to the Tibetans. These beggers are professionals, having less meritorious intentions than religious pilgrims. Just wave them off as the locals do if you don’t want give anything.