One of the tests that an invention must pass to be eligible for a patent is

a. it must be a machine
b. it must be economical to produce
c. it must be capable of providing economic benefit
d. it must not be obvious to a person having ordinary skill in the same field

By 2020, automobile market analysts expect that the demand for electric autos will increase as buyers become more familiar with the technology. however, the costs of producing electric autos may increase because of higher costs for inputs (e.g., rare earth elements), or they may decrease as the manufacturers learn better assembly methods (i.e., learning by doing). what is the expected impact of these changes on the equilibrium price and quantity for electric autos?