Sentence:  "Why, there ain't going to be any wheat left in Chicago by May! If I get in now and buy a long line of cash wheat, where are all these fellows who've sold short going to get it to deliver to me?" . . . Jadwin sprang forward, gripping the broker by the shoulder. "Sam," he shouted, ". . . we can <WSD>corner the market</WSD>!" 
Meaning of the word marked with <WSD> tags:  To monopolize a resource or commodity, as with the intent of driving up prices.