MVP (Minimum viable product)
It reffers to a first version of your product or idea, that will allow you to gather as much information as possible using only the necessary resources.
Launching a new product to the market can be complicated, costly and risky. Therefore, the best option might be to start with a small series of you product to ensure that it is what the client desires.
Production under demand
Produce what you need or what you sell, and forget about stocks!