14. A firm hires some number of custodians to clean a large warehouse. When only a few custodians are hired, they can quickly find and remove a lot of dust and debris. As the number of custodians...

14. A firm hires some number of custodians to clean a large warehouse. When only a few custodians are hired, they can quickly find and remove a lot of dust and debris. As the number of custodians increases, additional custodians have to go to greater lengths and spend more time to find and remove additional dust and debris. What property of production functions is relevant to the custodians’ situation?