Companies are competing for the same market share.

As an example, what are you going to do with four times more accountants than the total market needs? There are only a limited number of companies to do the accounts for. If one accountant can do four times the work as before, he might be able to expand. If every accountant can do four times the work as before, they cannot all expand. On a company level, why would you keep all the staff doing only 25% of the work as before? Their labour has been significantly reduced in value.