Comment by zugi

Or, the world needs more of your field because it's now cheaper.

I've often heard of house painting as an example of this. It used to take a crew of 8 with buckets, paintbrushes, and ladders to repaint a house. Then paint rollers came along and it got easier. Then sprayers came along and it got even easier. Costs fell, so now people want their houses painted far more often. Landlords now nearly always fully repaint apartments between tenants. As cost fell, painting demand rose.