Answer:
At least during the last couple of decades, service firms tend to generate sustained growth while manufacturing firms do not.
Step-by-step explanation:
The last president that recorded a steady manufacturing growth rate was Bill Clinton.
Service firms are growing steadily and probably will continue to do it. While manufacturing firms have been slowing down, their growth rate (if any) is not very large during the past few years and that tendency has increased with the new trade barriers imposed by our government during the last couple of years.
Another thing that helps the growth of service firms is that when manufacturing firms or agricultural firms grow, they need more services, so service firms will grow even more.