Charles W. answered  02/05/21
AP/IB Certified and Experienced Microeconomics/Macroeconomic teacher
A negative supply shock is the same thing as Stagflation (a leftward shift of the SRAS curve).
Stagflation shows the PL increasing and Output decreasing while increasing unemployment.
The only way to show the PL (Inflation) increasing and unemployment increasing is a rightward shift of the SR Phillips Curve.
 
     
             
 
                     
                    