azb arizona business july 2002 1 state university s monthly newsletter on the economy volume 49 number 7 center for research economic base study high tech manufacturing key activity in az greater than raises possibility that area may specialize by serving customers from outside to an extent excess of national average however can have above levels without any sales non residents if purchasing preferences vary norm desert example activities related air conditioners purchase maintenance and repair component because climate induced expenditures local quantify a sector is larger calculated location quotient total county employment be 800 industry it indicates employs more whether due export or conditions cause