Fixed assets depreciate in value over time, due to wear and tear and market obsolescence. It is not consistent to value and depreciate fixed assets using different bases. This caused these crops to depreciate in value. Businesses depreciate long-term assets for both accounting and tax purposes. Otherwise, the machinery would not be effective in raising surplus value and instead depreciate it. One approach is to depreciate the assets over time. In this case, the real exchange rate would depreciate and the growth rate would increase. Depending on market conditions, cars may depreciate between 10-30% the first year. Knowledge acquired through learning by doing can depreciate over time. Then this vehicle will depreciate at $3,000 per year, i.e. (17-2)/5 = 3. The party uses different methods to mentally depreciate Joy.