Economist: In 2015,the average per-person amount paid for goods and services purchased by consumer in Country X was the equivalent of $17,570 in United States dollars,just 30 percent of the corresponding figure of $58,566 for Country Y.Yet in 2015,there was already a substantial middle class in Country X that had discretionary income for middle-class consumer goods such as new vehicles,computers,or major household appliances,while a significant portion of the middle class in Country Y did not have sufficient income to purchase such items.
Which of the following, if true, most helps explain the discrepancy in the relationships described by the economist?
【选项】In Country Y as well as in Country X, there are few assembly-line jobs in factories that pay a middle-class wage.
选项是否正确？