请帮忙解释一下题目的意思

mjiirggh

看了argument里的第77题，请教表达一个什么意思？偶是句句话都懂了，却不懂作者想表达的意思，很痛苦，请指教！谢谢！

The following appeared in a letter to the editor of a popular science and technology magazine.

“It is a popular myth that consumers are really benefiting from advances in agricultural technology. Granted — consumers are, on the average, spending a decreasing proportion of their income on food. But consider that the demand for food does not rise in proportion with real income. As real income rises, therefore, consumers can be expected to spend a decreasing proportion of their income on food. Yet agricultural technology is credited with having made our lives better.”

himba

大概意思： 消费者实际上没有从农业技术的进步获利多少。 的确人们在食物支出在总支出上的比重小了，但这实际上是因为人们的收入多了。