How is a "big corporation" defined? Limiting the number of employees a company has (1000? 10,000? 100,000?) would have interesting effects. Companies might be less likely to hire junior people. Bigger companies would need to outsource or hire contractors to avoid hitting their employee limit. There would be competition among companies providing outsourcing or contractor services. That could be good for companies outsourcing work (having more choices), but there would be a lot of market inefficiencies.