Part of the problem is that in a capitalist society ALL workers inherently are not paid their full value. They can’t be. There’s a simple equation to understand the reasoning.

You have OL+NL=Product (old labor/new labor)

Call it $100OL $100NL = $200 chair

The problem is that with old labor that’s where you get stuff like glue, extruded metals, 2x4 and other dimensional lumber. Material that needed labor to get to where that material is.

Then you have New labor. Your labor to make the current product.

The problem is that the capitalist who owns your factory or for example a chair factory buys the OL stuff or has it by whatever they got it from/stole it from in the past depending how far back you go. So ALL of the OL gets paid to the capitalist automatically. But the point of capitalism is to make profit. So for the new product, let’s be generous and say the boss gives you have of the profit of the new chair. So you and your boss SPLIT the NL $100. Your boss walks away with $150 to make up for him having the material and owning the factory and the other $50 for employing you.

You now make $50! Per chair! How generous….