The basic trade$-$off to consider during overbooking is between

A$.$

having high sales or a shortage of capacity $($or inventory$).$

B$.$

having wasted capacity $($or inventory$)$ or excess capacity $($or inventory$).$

C$.$

having lost sales or a shortage of capacity $($or inventory$).$

D$.$

having wasted capacity $($or inventory$)$ or a shortage of capacity $($or inventory$).$