The table below presents the industry output for three different industries.

$\backslash$table$[[$Firm$,\backslash$table$[[$Industry $1],[$Output$]],\backslash$table$[[$Industry $2],[$Output$]],\backslash$table$[[$Industry $3],[$Output$]]],[$Firm A$,50,100,10],[$Firm B$,50,0,10],[$Firm C$,50,0,10],[$Firm D$,0,0,10],[$All other firms,$0,0,100]]$

Instructions: Round your answers to two decimal places.

a$.$ Calculate the four$-$firm concentration ratio for each industry.

Industry $1$: $q,$

Industry $2$ : $\%$

Industry $3$: $\%$

b$.$ Based on the information provided, what market structure best characterizes eac

Industry $1$: $$

Industry $2$

Industry $3$: $$