¿Cuál es la diferencia clave entre un acuerdo de Subasta privada (PA) y una Promoción preferida (PD) en Amazon DSP?

Private Auctions (PAs) involve a variable CPM, meaning the price for impressions can fluctuate based on bidding among a limited group of buyers. Preferred Deals (PDs), on the other hand, are characterized by a fixed CPM, where the price is pre-negotiated and guaranteed between the publisher and the buyer. The option stating PAs have a fixed price and PDs have a floor price is incorrect; PAs are variable, and while PDs have a fixed price, it's not a floor in the same sense as an open auction. The third option describes general features of programmatic deals but doesn't capture the core pricing difference between PAs and PDs.