The economy of ergonomics (saving through preventing injuries).
The ergonomy of economics (haven’t figured that one out).
A quick google on “ergonomic economy” turns up with articles on the aforesuggested (word!) matter:
“The economy of ergonomic improvements is reported as case studies from four Swedish companies. Poor workplace ergonomics and related musculoskeletal problems were already known and had caused repeated sick- leave periods at these workplaces. Expenses associated with certain preventive activities were accounted for and financial effects were estimated based on interviews with representatives at the companies. When costs were compared to gains, the improvements appeared to be highly profitable.”