What do the inquiry bid and assembly bid mean in the promotion of Pinduoduo?

Hello, what do you mean by inquiry bid and collection bid in Pinduoduo promotion? Bid by inquiry, for example, your bid is 4 yuan for an inquiry, which means that the customer will pay 4 yuan for a consultation, and the collection is the same. For example, if you bid 1 yuan for a collection, buyers will receive 1 yuan when they see your promotion, place an order and receive your goods.