Second, you should consider the cost of this tool. I took a look and found that the cost (using ordinary metal materials) must be above 10 yuan, so its retail price will exceed that of 30 yuan (profits and taxes of enterprises, agents and retailers), so it is doomed that there will not be too many users, and there are many knives in the market.
Generally speaking, the profit of each product multiplied by the expected annual sales volume of this product is the upper limit of the transfer price of this patent, because the actual validity period of this patent is only a few years, and the enterprise has to bear risks and cannot pay more, so you can roughly estimate how much it is worth.