The corporations set the price of a share for the pre-emptive rights at the nominal value of the shares rather than the market value of those shares

Preemptive rights are those rights which will be providing the shareholders with right to buy additional shares in any future issue of the company's common stock before the shares will be available to the common public and these will be issued at the the nominal value rather than market value.

This will be benefiting the shareholder because shareholder will be protected against any kind of the issuance of the stock at lower price than the current market price because he will have the right to subscribe to the shares and hence he will be subscribing the shares on a prioritised basis and he will be avoiding any kind of risk associated with loss of opportunity.

it will help the corporation because it will not dilute the existing control as the shareholders who are currently the shareholders of the company will continue to be the shareholders of the company and they will be lack of dilution which will be benefiting the company.