Answer:
Sing Happy Birthday and thank the parents for sharing the cupcakes, but respectfully decline and remind them of the BACB ethical code, which does not allow any giving or receiving of gifts of any kind.
Explanation:
I believe the answer is: Single seller
A single seller market is another name for a monopolistic market. In this market, only one company/organization control the sales of a certain product.
Since there is no competitor in the market, a single seller company could increase the price of its product as high as it can to maximize profit without worries since the consumers do not have any other option.
I think it is the treaty of Velasco I'm sorry I don't really know if this is % correct
