NIKE INC 10-K form for the fiscal year ended 2018-05-31, page 46: 
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|  2 | NIKE, Inc. Consolidated Balance Sheets |

|    |                                                      |         |        |      |        |    |        |
|---:|:-----------------------------------------------------|:--------|:-------|:-----|:-------|:---|:-------|
|  2 |                                                      | May 31, |        |      |        |    |        |
|  3 | (In millions)                                        | 2018    |        | 2017 |        |    |        |
|  4 | ASSETS                                               |         |        |      |        |    |        |
|  5 | Current assets:                                      |         |        |      |        |    |        |
|  6 | Cash and equivalents                                 | $       | 4,249  |      |        | $  | 3,808  |
|  7 | Short-term investments                               | 996     |        |      | 2,371  |    |        |
|  8 | Accounts receivable, net                             | 3,498   |        |      | 3,677  |    |        |
|  9 | Inventories                                          | 5,261   |        |      | 5,055  |    |        |
| 10 | Prepaid expenses and other current assets            | 1,130   |        |      | 1,150  |    |        |
| 11 | Total current assets                                 | 15,134  |        |      | 16,061 |    |        |
| 12 | Property, plant and equipment, net                   | 4,454   |        |      | 3,989  |    |        |
| 13 | Identifiable intangible assets, net                  | 285     |        |      | 283    |    |        |
| 14 | Goodwill                                             | 154     |        |      | 139    |    |        |
| 15 | Deferred income taxes and other assets               | 2,509   |        |      | 2,787  |    |        |
| 16 | TOTAL ASSETS                                         | $       | 22,536 |      |        | $  | 23,259 |
| 17 | LIABILITIES AND SHAREHOLDERS' EQUITY                 |         |        |      |        |    |        |
| 18 | Current liabilities:                                 |         |        |      |        |    |        |
| 19 | Current portion of long-term debt                    | $       | 6      |      |        | $  | 6      |
| 20 | Notes payable                                        | 336     |        |      | 325    |    |        |
| 21 | Accounts payable                                     | 2,279   |        |      | 2,048  |    |        |
| 22 | Accrued liabilities                                  | 3,269   |        |      | 3,011  |    |        |
| 23 | Income taxes payable                                 | 150     |        |      | 84     |    |        |
| 24 | Total current liabilities                            | 6,040   |        |      | 5,474  |    |        |
| 25 | Long-term debt                                       | 3,468   |        |      | 3,471  |    |        |
| 26 | Deferred income taxes and other liabilities          | 3,216   |        |      | 1,907  |    |        |
| 27 | Commitments and contingencies (Note 15)              |         |        |      |        |    |        |
| 28 | Redeemable preferred stock                           | -       |        |      | -      |    |        |
| 29 | Shareholders' equity:                                |         |        |      |        |    |        |
| 30 | Common stock at stated value:                        |         |        |      |        |    |        |
| 31 | Class A convertible - 329 and 329 shares outstanding | -       |        |      | -      |    |        |
| 32 | Class B - 1,272 and 1,314 shares outstanding         | 3       |        |      | 3      |    |        |
| 33 | Capital in excess of stated value                    | 6,384   |        |      | 5,710  |    |        |
| 34 | Accumulated other comprehensive loss                 | (92     | )      |      | (213   | )  |        |
| 35 | Retained earnings                                    | 3,517   |        |      | 6,907  |    |        |
| 36 | Total shareholders' equity                           | 9,812   |        |      | 12,407 |    |        |
| 37 | TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY           | $       | 22,536 |      |        | $  | 23,259 |

The accompanying Notes to the Consolidated Financial Statements are an integral part of this statement.

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Question: How has Nike's working capital changed from 2017 to 2018, and what does this indicate about its operational efficiency?
Answer: To calculate Nike's working capital and its change over the past year:

Formula:
Working Capital = Current Assets - Current Liabilities

Data from the document:

Current Assets (2018) = $15,134 million
Current Liabilities (2018) = $6,040 million
Current Assets (2017) = $16,061 million
Current Liabilities (2017) = $5,474 million
Calculation:
2018 Working Capital = 15,134 - 6,040 = $9,094 million
2017 Working Capital = 16,061 - 5,474 = $10,587 million
Change in Working Capital = 9,094 - 10,587 = -$1,493 million

Implications:
Nike's working capital decreased by $1,493 million from 2017 to 2018. This reduction may reflect tighter management of current assets and liabilities, improved operational efficiency, or a strategic shift in liquidity.