It looks like you're referring to a situation where specific elements (possibly the "Ps") can significantly influence the outcome of a decision or action, such as making a purchase or not. The "Ps" could refer to concepts in marketing, such as the 4 Ps: Product, Price, Place, and Promotion.
To complete your sentence, you might say something like:
"Any one of the Ps could be the difference between you making a purchase or going home without purchasing anything."
If you need more context or specific examples related to the Ps, feel free to ask!