No matter what kind of high-end goods, if it cannot be used…

No matter what kind of high-end goods, if it cannot be used to produce low-grade economic goods, then it cannot obtain or maintain economic nature.

Menger在Economics领域取得突破性进展后转而浸入其它社会科学领域。可能想等到在其它领域取得在Economics领域所达到的成就，或者至少是能令自己满意的高度，再调头回攻Economics。可叹天不假年。