And employees conspire to get more by gaining experience then moving to other companies, differentiating themselves and asking for raises?

You are describing negotiation.

Companies are not supposed to want to raise wages any more than employees are supposed to want to lower wages. The balance is how the market puts a value on different kinds of work and skills.

Sometimes it's a negotiation between parties each with some measure of power, but it can also be completely unilateral like using layoffs and redundancies and shutdowns and bankruptcies as an accounting tool and not necessarily because they're losing money or making strategic changes.