Ideally, a patent should cover a long enough period of time for the inventor to _____________, but that period should not be so long that it allows the inventor to _____________.
A. earn a hearty return; charge a high monopoly price permanentlyB. contribute to the social interest; only receive a slice of the social benefitsC. earn a rate of return; prevent broad public access to classic worksD. contribute to the social interest; prevent broad public access to inventions