> models don’t exist without training. I don’t see how excluding the training cost from the thing they are selling(inference) is perfectly reasonable Planes an

> models don’t exist without training. I don’t see how excluding the training cost from the thing they are selling(inference) is perfectly reasonable Planes and cars take a lot of capital to develop. That's a fixed cost. Building them consumes labour and resources. Those are variable costs. It's useful to know the slop of the variable-cost function.