Additional Patient On The Savc And Satc 546945

Suppose that with 400 patients per year, the SAFC, SATC and SMC of operating a physician clinic are $10, $35, and $30 per patient, respectively. Furthermore, suppose the physician decides to increase the annual patient load by one more patient. Using short-run cost theory, explain the impact of this additional patient on the SAVC and SATC. Do they increase or decrease? Why?