Basic research is non-excludable and non-rival. However, the government of Hamsterville has noticed that innovators are preferring to go to the beach instead of the lab because it takes time to develop new processes and products, but the innovators do not get any benefit out of it. As a result, the government has created a patent system that gives inventors the right to be the sole producer of anything invented for 15 years. When the government created the patent system, what kind of good did basic research effectively become?

a. Public good
b. Private good
c. Collective good
d. Common good
e. A good with positive externalities