What may be the complementary relationship, in terms of employment, between illegal fruit pickers and domestic-born truck drivers?

As with legal immigrants, some illegal workers are complementary inputs to domestic-born workers, not substitutes. An example is the illegal fruit pickers and the domestic-born truck drivers who deliver the fruit to grocery stores. The lower price of the fruit increases the amount of fruit demanded and thus the amount of it that needs to be delivered. As a result, the labor demand increases for the complementary truck drivers whose wage rates rise.