There are a ton of items in The Bazaar that can scale infinitely, it's up to you to find ways to empower them.
Doing so can be especially powerful if you can get the ball rolling early on - however, if you find a stacking item later on in a run, you might want to avoid them.
Here are two examples of how to navigate your stack management.
Example #1: Lemonade Stand
The Lemonade Stand scales your Max Health when you sell Small items.
This makes it a great combo with items that can generate Small items, such as Money Tree (creates a Spare Change upon level up) and the Cash Register (creates 3 Spare Change at the start of each day).
Options like Gumballs and Chocolates also become more attractive as you can simultaneously get their base buffs but also feed your stacks.
With Pygmalien's economic power, you can even consider buying every Small item you see so you can sell them.
Pro tip: Items with effects that happen outside of combat (like Lemonade Stand, Money Tree, and Cash Register) activate when they're in your Stash! They do NOT need to be equipped on your main board.
Example #2: Langxian
While the Lemonade Stand boosts your defense, the Langxian spear scales your offensive power by stacking with victories.
Remember earlier how we mentioned short term vs long term decisions?
Langxian allows you to play aggressively with short term decisions while simultaneously helping you build for the future.
For instance, you can consider opting for the Temporary Damage boost or other instant effects to keep the ball rolling.
Also, if the Langxian is still ramping up, you might want to choose easier PvE fights to help ensure an easier win.
Just make sure to not tunnel vision, if you aren't hitting Langxian upgrades it might not be worth committing to.