Warn you if there’s a way you could get a product for cheaper before you purchase it.

ShiraNamiNani discovered this feature while purchasing Unrailed 2: Back on Track. At press time, this game was 30% off, for a total of $13.99. However, the Unrailed Collection Bundle, which includes both Unrailed 2: Back on Track and its predecessor, had a bigger discounted rate of 58%, meaning it only cost $13.58 – 41 cents cheaper than buying just the second game on its own. This is likely what triggered this alert, as it allowed them to not only save money but also get an extra game in the process.

"they will not be recommended to purchase the larger version if the total cost is still higher."

More Link: https://www.gamingbible.com/news/platform/steam/steam-store-addition-saves-you-money-194091-20251213