QUESTION $3$

To date, patients with kidney failure have had to rely on dialysis machines and kidney donors. Now suppose that an implantable artificial kidney has been approved by the Food and Drug Administration and is being offered as an economical alternative to dialysis machines and kidney donors.

Implantable artificial kidneys and dialysis are $q,[$complements$,$ substitutes$].$ As the price of implantable artificial kidneys declines, the demand for dialysis services will $$ increase, decrease$].$

$[$This is a multiple$-$answer question. Check all and only those answers you believe are correct.$]$

complements

substitutes

increase

decrease