In finance, to corner the market is to purchase enough of a particular stock, commodity, or other asset to allow the price to be manipulated, by analogy to the general business jargon where a company described as having "cornered the market" has a very high market share. The cornerer hopes to gain control of enough of the supply of the commodity to be able to set the price for it
It's shocking to see a film like this suddenly become relevent again 100 years later. Griffith juxtaposes the wheat tycoons, the farmers, and the people who buy it, and the result is one of the most important films ever made. I'll never forget the shot of the people lined up for bread, which they cannot afford, nor will ever forget the films final shot, a farmer attempting to plant seeds in an empty field.