In my region we have a money saving system. Some friends or relatives or colleagues, gather and decided to give a particular amount a month to one of us appointed as the manager. He doesn’t receive any charges for this. You can say he only keeps the money.
Supposing, there are ten people, and each person gives 100 $, this makes a sum of 1000 $ a month. For ten months each person gives this amount (100 $) and the sum (1000 $) is given to one of the members of the group.
What would you call it? Is there any particular name for this thing in English?