How are "residual values" generally determined?

Residual values are typically determined by analyzing a combination of historical depreciation rates and market analysis. This approach allows for a more accurate projection of an asset's value at the end of its useful life. Historical depreciation rates provide insights into how similar assets have depreciated over time, while market analysis looks at current market conditions, trends, and the particular demand for the asset. This dual approach ensures that the residual value reflects a realistic estimate that takes into account both past performance and current circumstances in the market.

The other options do not provide as comprehensive a method for determining residual values. For instance, relying solely on current market trends may overlook the historical depreciation patterns that characterize the asset's lifecycle. Averaging the costs of comparable assets might not accurately reflect the specific conditions affecting the asset in question. Lastly, using the asset's original purchase price fails to account for depreciation and changes in market conditions over time, which are crucial for an accurate residual value estimation.