You've most likely heard about Rocket League keys. The prices of the items were mostly determined by these keys. The game's makers, however, eliminated both keys and crates with the 2019 update. They introduced blueprints and Rocket League Credits, which will be used as currency.
How to price
The Rocket League item database is massive. There are thousands of items, each with its own distinct design and feel. The range of things may most likely overwhelm you if you are just getting started. Furthermore, each item has its own price tag, making it very impossible to memorize all of the values.
The pricing works in the same way that it does in the real world: the rarer an item is, the higher the price tag. Supply and demand have an impact on prices. This is why you'll notice that item prices change frequently.
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