Six months ago the cost of an important input in an industry increased. then, three months later another change occurred. production engineers invented a new method that uses fewer raw materials for the same level of production. if these were the only two events that influenced production in the last six months, what has been the influence on the supply? a. six months ago the supply curve shifted to the left, and then three months ago the quantity supplied at each price fellb. the first event caused production to decrease and supply to drop, but the second event increased supply above what it had been originally. c. the influences of both events had equal effects on the supply, only one was negative and the other positive so that they perfectly balanced outd. the event of six months ago caused added costs to production and then lowered supply. the event of three months ago allowed more to be produced at each price; so the supply increased.