The average executive-level position is paid anywhere from five times to twenty times the salary of their average subordinate employee. This salary often includes a wide variety of perks, which are at the discretion of the upper management or board members, and when the company does poorly, the executives are paid well to leave the company.
Regular employees on the other hand are rarely paid "market value" and are not privy to the same perks. Raises for average workers generally do not cover tax and healthcare increases. Employers have forgotten that it's the entire staff, including the lowest employee that make the company run.
Legislating corporate salaries puts more money in the pockets of the middle and lower classes, boosts the economy, and generates more taxable revenue.