Example hedge

A stock trader believes that the stock price of Company A will rise over the next month, due to the company's new and efficient method of producing widgets. He wants to buy Company A shares to profit from their expected price increase. But Company A is part of the highly volatile widget industry. If the trader simply bought the shares based on his belief that the Company A shares were underpriced, the trade would be a speculation.

Since the trader is interested in the company, rather than the industry, he wants to hedge out the industry risk by short selling an equal value (number of shares × price) of the shares of Company A's direct competitor, Company B. If the trader was able to short sell an asset whose price had a mathematically defined relation with Company A's stock price (for example a call option on Company A shares) the trade might be essentially riskless and be called an arbitrage. But since some risk remains in the trade, it is said to be "hedged."