One person’s consumption of a product reduces the amount available for other people.

answer; ///private product;

answer; the overproduction of cotton destroyed the soil;

replace   c   with   a   and simplify.

a = c , b = a, q = n , 2 , a = c , 900 b= a , 700 , q = n , 600 , 2 = b o t h , b = a , q = n