To design accounting-based performance measures, we must consider different ways to measure the assets included in the investment calculations. Should the assets be measured at historical cost or current cost? Should gross book value (that is, original cost) or net book value (original cost minus accumulated depreciation) be used for depreciable assets?
Current cost is the cost of purchasing an asset today identical to the one currently held or the cost of purchasing an asset that provides services like the one currently held if an identical asset cannot be purchased. Of course, measuring assets at current costs will result in different ROIs than the ROIs calculated on the basis of historical costs.
We illustrate the current-cost ROI calculations using the data for Hospitality Inns (Exhibit 24-1) and then compare current-cost-based ROIs and historical-cost-based ROIs. Consider the following additional information about the long-term assets of each hotel:

The table depicts age of facility in years, gross book value, accumulated depreciation, net book value, and depreciation for 2020 for hotels in San Francisco, Chicago, and New Orleans. The details of the table are as follows:
1. Age of facility in years, at end of 2020
San Francisco: 8
Chicago: 4
New Orleans: 2
2. Gross book value, original cost
San Francisco: 1,400,000 dollars
Chicago: 2,100,000 dollars
New Orleans: 2,730,000 dollars
3. Accumulated depreciation
San Francisco: 800,000 dollars
Chicago: 600,000 dollars
New Orleans: 390,000 dollars
4. Net book value at end of 2020
San Francisco: 600,000 dollars
Chicago: 1,500,000 dollars
New Orleans: 2,340,000 dollars
5. Depreciation for 2020
San Francisco: 100,000 dollars
Chicago: 150,000 dollars
New Orleans: 195,000 dollars
Hospitality Inns assumes its facilities have a 14-year estimated useful life and zero terminal disposal value and uses straight-line depreciation.
An index of construction costs indicating how the cost of construction has changed over the 8-year period Hospitality Inns has been operating is as follows:
| Year | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 |
|---|---|---|---|---|---|---|---|---|
| Construction cost index | 110 | 122 | 136 | 144 | 152 | 160 | 174 | 180 |
Earlier in this chapter, we computed an ROI of 24% for San Francisco, 15% for Chicago, and 17% for New Orleans (see section Return on Investment). One possible explanation for the high ROI for the San Francisco hotel is that its long-term assets are expressed in 2012 construction-price levels—prices that prevailed 8 years ago—and the long-term assets for the Chicago and New Orleans hotels are expressed in terms of higher, more recent construction-price levels, which depress ROIs for these two hotels.
Exhibit 24-2 illustrates a step-by-step approach for incorporating current-cost estimates of long-term assets and depreciation expense into the ROI calculation. We make these calculations to approximate what it would cost today to obtain assets that would produce the same expected operating income the subunits currently earn. (For RI and EVA calculations, similar adjustments to represent the current costs of capital and depreciation expense can be made.) The current-cost adjustment reduces the ROI of the San Francisco hotel by more than half.

Details as follows:
Step 1: Restate long-term assets from gross book value at historical cost to gross book value at current cost as of the end of 2020.
San Francisco
Gross book value of long-term assets at historical cost: $1,400,000
Construction cost index in 2020: 180
Construction cost index in year of construction: 100
Gross book value of long-term assets at current cost at end of 2020 (above 1 multiplied with (above 2 divided by above 3)): $2,520,000
Chicago
Gross book value of long-term assets at historical cost: $2,100,000
Construction cost index in 2020: 180
Construction cost index in year of construction: 144
Gross book value of long-term assets at current cost at end of 2020 (above 1 multiplied with (above 2 divided by above 3)): $2,625,000
New Orleans
Gross book value of long-term assets at historical cost: $2,730,000
Construction cost index in 2020: 180
Construction cost index in year of construction: 160
Gross book value of long-term assets at current cost at end of 2020 (above 1 multiplied with (above 2 divided by above 3)): $3,071,250
Step 2: Derive net book value of long-term assets at current cost as of the end of 2020. (Assume estimated useful life of each hotel is 14 years.)
San Francisco
Gross book value of long-term assets at current cost at end of 2020: $2,520,000
Estimated remaining useful life: 6
Estimated total useful life: 14
Net book value of long-term assets at current cost at end of 2020 (above 1 multiplied with (above 2 divided by above 3)): $1,080,000
Chicago
Gross book value of long-term assets at current cost at end of 2020: $2,625,000
Estimated remaining useful life: 10
Estimated total useful life: 14
Net book value of long-term assets at current cost at end of 2020 (above 1 multiplied with (above 2 divided by above 3)): $1,875,000
New Orleans
Gross book value of long-term assets at current cost at end of 2020: $3,071,250
Estimated remaining useful life: 12
Estimated total useful life: 14
Net book value of long-term assets at current cost at end of 2020 (above 1 multiplied with (above 2 divided by above 3)): $2,632,500
Step 3: Compute current cost of total assets in 2020. (Assume current assets of each hotel are expressed in 2020 dollars.)
San Francisco
Current assets at end of 2020 (from Exhibit 24-1): $400,000
Long-term assets from Step 2: $1,080,000
Current cost of total assets at end of 2020 (Sum of above and above 2): $1,480,000
Chicago
Current assets at end of 2020 (from Exhibit 24-1): $500,000
Long-term assets from Step 2: $1,875,000
Current cost of total assets at end of 2020 (Sum of above and above 2): $2,375,000
New Orleans
Current assets at end of 2020 (from Exhibit 24-1): $660,000
Long-term assets from Step 2: $2,632,500
Current cost of total assets at end of 2020 (Sum of above and above 2): 3,292,500
Step 4: Compute current-cost depreciation expense in 2020 dollars.
San Francisco
Gross book value of long-term assets at current cost at end of 2020 (from Step 1): $2,520,000
Estimated total useful life: 14
Current-cost depreciation expense in 2020 dollars (value of above 1 divided by above 2): $180,000
Chicago
Gross book value of long-term assets at current cost at end of 2020 (from Step 1): $2,625,000
Estimated total useful life: 14
Current-cost depreciation expense in 2020 dollars (value of above 1 divided by above 2): $187,500
New Orleans
Gross book value of long-term assets at current cost at end of 2020 (from Step 1): $3,071,250
Estimated total useful life: 14
Current-cost depreciation expense in 2020 dollars (value of above 1 divided by above 2): $219,375
Step 5: Compute 2020 operating income using 2020 current-cost depreciation expense.
San Francisco
Historical-cost operating income: $240,000
Current-cost depreciation expense in 2020 dollars (from Step 4): $180,000
Historical-cost depreciation expense: $100,000
Operating income for 2020 using current cost depreciation expense in 2020 dollars (above 1 minus (difference between above 2 and above 3): $160,000
Chicago
Historical-cost operating income: $300,000
Current-cost depreciation expense in 2020 dollars (from Step 4): $187,500
Historical-cost depreciation expense: $150,000
Operating income for 2020 using current cost depreciation expense in 2020 dollars (above 1 minus (difference between above 2 and above 3): $262,500
New Orleans
Historical-cost operating income: $510,000
Current-cost depreciation expense in 2020 dollars (from Step 4): $219,375
Historical-cost depreciation expense: $195,000
Operating income for 2020 using current cost depreciation expense in 2020 dollars (above 1 minus (difference between above 2 and above 3): $485,625
Step 6: Compute ROI using current-cost estimates for long-term assets and depreciation expense.
San Francisco
Operating income for 2020 using current cost depreciation expense in 2020 dollars (from Step 5): $160,000
Current cost of total assets at end of 2020 (from Step 3): $1,480,000
ROI using current-cost estimate (above 1 divided by 2): $10.8%
Chicago
Operating income for 2020 using current cost depreciation expense in 2020 dollars (from Step 5): $262,500
Current cost of total assets at end of 2020 (from Step 3): $2,375,000
ROI using current-cost estimate (above 1 divided by 2): $11.1%
New Orleans
Operating income for 2020 using current cost depreciation expense in 2020 dollars (from Step 5): $485,625
Current cost of total assets at end of 2020 (from Step 3): $3,292,500
ROI using current-cost estimate (above 1 divided by 2): $14.7%.
| Historical-Cost ROI | Current-Cost ROI | |
|---|---|---|
| San Francisco | 24% | 10.8% |
| Chicago | 15% | 11.1% |
| New Orleans | 17% | 14.7% |
Adjusting assets to recognize current costs negates differences in the investment base caused solely by differences in construction-price levels. The current-cost ROI better measures the current economic returns from the investment than the historical-cost ROI does. If Hospitality Inns were to invest in a new hotel today, investing in one like the New Orleans hotel offers the best ROI.
Current-cost estimates can be difficult to obtain for some assets. Why? Because the estimate requires a company to consider, in addition to increases in price levels, technological advances and process improvements that could reduce the current cost of assets needed to earn today’s operating income.
The historical cost of assets is often used to calculate ROI. There has been much discussion about whether managers should use gross book value or net book value of assets. Using the data in Exhibit 24-1, we calculate ROI using net and gross book values of plant and equipment:
| Operating Income (from Exhibit 24-1) (1) | Net Book Value of Total Assets (from Exhibit 24-1) (2) | Accumulated Depreciation (from page 933) (3) | Gross Book Value of Total Assets | 2020 ROI Using Net Book Value of Total Assets Calculated Earlier | 2020 ROI Using Gross Book Value of Total Assets | |
|---|---|---|---|---|---|---|
| San Francisco | $240,000 | $1,000,000 | $800,000 | $1,800,000 | 24% | 13.3% |
| Chicago | $300,000 | $2,000,000 | $600,000 | $2,600,000 | 15% | 11.5% |
| New Orleans | $510,000 | $3,000,000 | $390,000 | $3,390,000 | 17% | 15.0% |
Using gross book value, the 13.3% ROI of the older San Francisco hotel is lower than the 15.0% ROI of the newer New Orleans hotel. Those who favor using gross book value claim it enables a firm to compare ROI across its subunits more accurately. For example, when using gross-book-value calculations, the return on the original plant-and-equipment investment is higher for the newer New Orleans hotel than for the older San Francisco hotel. This difference probably reflects the decline in earning power of the San Francisco hotel. Using the net book value masks this decline in earning power because the constantly decreasing investment base results in a higher ROI for the San Francisco hotel—24% in this example. This higher rate may mislead decision makers into thinking that the earning power of the San Francisco hotel has not decreased.
The proponents of using net book value as an investment base maintain that it is less confusing because (1) it is consistent with the amount of total assets shown in the conventional balance sheet, and (2) it is consistent with income computations that include deductions for depreciation expense. Surveys report that the net book value is the measure of assets most commonly used by companies for internal performance evaluation.