California raisins compete in quality with the famous Malaga varieties and the large crop of last year has been in in part shipped abroad to supply a deficit in the Malaga product. The culture of raisin-grapes is increasing so rapidly in California that the raisin industry there bids fair to become one of the largest in the world...--From Good Housekeeping--
...The scarcity of the right kind of labor is the main difficulty with which California growers have had to contend so far.
Industries springing up and growing so fast they can't find enough people to hire. That's what unbridled capitalism can lead to.