cornering the market

In finance, to corner the market is to get sufficient control of a particular stock, commodity, or other asset to allow the price to be manipulated. Another definition: "To have the greatest market share in a particular industry without having a monopoly. Companies that have cornered their markets usually have greater leeway in their decisions; for example, they may charge higher prices for their products without fear of losing too much business. Large companies, such as Wal-Mart or Microsoft, are considered to have cornered their markets." In either case, the cornerer hopes to gain control of enough of the supply of the commodity to be able to set the price for it.