According to Paul Romer, a new growth economist,

a. economic growth can continue unimpeded, as long as we keep coming up with new ideas.

b. while the market is a great engine for economic growth, it can be “turbocharged” with strong institutional support for education and science.

c. economic growth comes from increases in value—rearranging fixed amounts of matter and making new combinations that are more valuable.

d. all of the above are true.