- If the new product or process is easily copied, then, without a patent, the innovator is unlikely to be able to earn enough revenues before others enter the market to recover the cost of research and development.
Without the prospect of the patent, research and development will not take place. The new idea will not be developed and introduced to the market. The patent is worth granting because without it the consumer and producer surplus (social gains) available even under monopoly would be lost.
- If it's difficult to copy the new idea quickly, the innovator might be able to earn sufficient revenues to cover the costs even without a patent. Development will occur anyway. In that case, a patent reduces the surplus.
The monopolist will not face competition and will restrict output for longer than would occur without a patent.
- There's no way to know ahead of time whether the innovation would have been developed in the absence of a patent or how many future inventions will fall in each category. Threfore, we grant patents to all new products and processes at the innovator's request.
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