The divergence between labor time and production time also means there is a lot of unproductive production time. If rent is paid by the farmer that rent covers the entire growing year, regardless of whether they are engaged in value producing labor. Large-scale, industrial agriculture also involves significant sunken costs, in machinery, buildings, land, and so forth. Many of these items are not only steadily depreciating but can lay idle for many months of the year. A US$100,000 combine, for instance, may be used for only a couple of weeks during the fall harvest. The remainder of the year it lies in the machine shed collecting dust and depreciating. This"[i]dle, constant capital thus appears as a burden to the farmer and something to be avoided by the capitalist" (Mann and Dickinson 1978: 475).