Which of the following is a con to having no patent system?1 pointDiminished incentives to inventHigh screening costsReturn to competitive market pricing

The main disadvantage of not having a patent system is "Diminished incentives to invent".

Here's why:

1. Protection of Intellectual Property: A patent system protects the intellectual property of inventors. Without such a system, anyone could use an inventor's ideas without their permission or without giving them credit. This could lead to a significant decrease in the motivation to invent new products or technologies.

2. Financial Incentive: Patents can also provide a financial incentive for inventors. If an inventor knows that they can profit from their invention because it is protected by a patent, they are more likely to invest the time and resources necessary to create and develop new ideas.

3. Encourages Innovation: The prospect of obtaining a patent encourages inventors to continually strive for innovation. Without the patent system, there would be less motivation to push boundaries and create something new.

Therefore, without a patent system, the incentive to invent could be significantly diminished.