diagram above. If the economy is operating at PPF1, the economy may move to PPF as a result of an increase in resources a decrease in resources. a decrease in technology. a simultaneous decrease in both resources and technology. Resource X is necessary to the production of good Y. If the price of resource X falls, the supply curve of Y shifts leftward. the supply curve of Y shifts rightward the supply curve of Y is unaffected. there is a movement down the supply curve of Y