I'd like to focus on each of the three struggles individually. While each is broadly the same, the devil is in the details, so the details it is.
Now, before we begin, there needs to be some way to measure this struggle for us to even hope to study it. Luckily, there are a couple, depending on certain factors. If a currency is backed by something, like, say, gold, then wages are the best measure. When wages are high, the workers have a lot of power. When wages are low, the bosses have a lot of power. If a currency is fiat, then inflation is a better measure. When wages rise, bosses need to raise prices, if they want to continue to make money. In reality, inflation under a fiat currency is measuring wages, but it is aggregate so it's a better method. (This is the part I'm most unsure about and the part that will go through many revisions in the future. Any way to improve this part any of you can think of can go in the comments. Thank you.)
In addition, there are many ways for one side to have power over the other. One basic thing is unemployment. When unemployment is high, the bosses have power since they can always find new workers, so they can fire workers with impunity. The opposite is true of low unemployment.
Of course, not everything can work like unemployment, and will only grant one side power. For example, unions can only really grant power to workers.
On the side of the bosses, they have similar organizing. The difference is theirs is institutionalized. The organizational structure of the company itself is the organization that empowers the bosses.
In addition, regardless of how they feel about each other outside of this struggle, all bosses are allies in this struggle and all workers are allies in this struggle. Workers who gain power encourage those who don't to unionize and fight for more power, just because they can see the other workers winning, which is inspiring.
That's why companies don't encourage workers of the companies they compete with to unionize. This is also why unions often strike when other unions strike in a show of solidarity and bosses share troublemakers with each other creating blacklists.
This creates inefficiency in a number of ways. First and foremost is strikes. That's time, energy, and resources being put into the struggle rather than elsewhere. Second is systemic unemployment. That's labor that could go somewhere productive, but isn't going anywhere. Third is the resources bosses use to regulate and control the workers.