"the data make it clear that the extra effect of this spending diminishes the more one has already has spent"
해석이 안되는 이문장 바로앞 문장은
If you think spending money on clothes,hair and cosmetics makes a difference, you'd be right.
But it's only a small difference.
what's more,he says,
" the data make it clear that the extra effect of this spending diminishes the more one has already spent"
입니다.
diminish 다음에 나오는 the more~ 부터 해석이 안되네요. ^^
감사드립니다.