Offering additional stock in this manner presents risks for both the company and the employee. If the option's strike price is higher than the market price of the stock, the employee's option is worthless. When an employee exercises an option, the company is required to issue a new share of stock that can be publicly traded. The company's market capitalization grows by the market price of the share, rather than the strike price that the employee purchases the stock for. The possibility of reduction of company earnings (impacting both the company and shareholders) arises when the company has a greater number of shares outstanding. To keep ahead of this possibility, earnings must increase at a rate equal to the rate at which outstanding shares increase. Otherwise, the company must repurchase shares on the open market to reduce the number of outstanding shares.