Retail mini game REAL inventory? Can you actually go out of inventory?

Can retail mini game run out of inventory, when the mini game do not actually use any of our REAL inventoy? In fact in my inventory I have 150+ cars so I am not sure when customer tried to buy, there was no inventory to serve them…
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@chuanmedia, You are correct, the mini-game is no longer related to your live game inventory. However, there are only 22 cars in the mini-game inventory.
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Once you have sold the 22 cars in the mini-game, you cannot play again until the indicated time has lapsed.