Why do you think that people might treat a small purchase like a snack, differently from the way they would treat the purchase of something like a washing machine?

because I machine washer can last longer than a snack, there for the machine washer has more purpose and is more expensive

Explanation:

“way of writing” should be replaced with “writing style"

“idea” should be replaced with “purpose.”

maybe   “people from a long time ago” should be replaced with “elizabethans.”