William Howard Taft,
Board of Trade of City of Chicago v…
“ The question of price dominates trade between the states. Sales of an article which affect the country-wide price of the article directly affect the country-wide commerce in it. By reason and authority, therefore, in determining the validity of this act, we are prevented from questioning the conclusion of Congress that manipulation of the market for futures on the Chicago Board of Trade may, and from time to time does, directly burden a d obstruct commerce between the states in grain, and that it recurs and is a constantly possible danger. ”
