A manufacturing plant adds employees to operate a fixed amount of machinery. Eventually the productivity of each additional worker declines because there is not enough space for every worker to use the machinery at a given time. This is an example of (Need help? Read chapter 2.3 of the textbook, here: https//playconomics.com/textbooks/view/playconomics4-201913/part2/ch2/s3) diminishing marginal utiity, All of these. the cost-benefit principle. the vertical interpretation of the supply curve. increasing marginal costs.