CALCULATION OF REGISTRATION FEE
| Maximum Aggregate | Amount of Registration | |||
| Title of Each Class of Securities Offered | Offering Price | Fee | ||
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| Buffered Return Enhanced Notes due January 2008 | $10,235,000.00 | $1,095.15 |
| Pricing Supplement | Pricing Supplement No. 156 |
| To prospectus dated January 25, 2006, and prospectus | Registration Statement No. 333-131266 |
| supplement for leveraged index-linked securities | Dated December 8, 2006; Rule 424(b)(2) |
| dated December 1, 2006 |
| Morgan Stanley | ||
| Structured | $10,235,000 | |
| Investments | Buffered Return Enhanced Notes Linked to the Nikkei 225 Index due | |
| January 17, 2008 |
| General | |
| The notes are designed for investors who seek a return of twice the appreciation of the Nikkei 225 Index up to a Maximum Total Return on the notes of 21.30% at maturity. Investors should be willing to forgo interest and dividend payments and, if the Index declines by more than 10%, be willing to lose some or all of their principal. | |
| Senior unsecured obligations of Morgan Stanley maturing January 17, 2008. | |
| Minimum purchase of $50,000. Minimum denominations of $1,000 and integral multiples thereof. | |
| The notes priced on December 8, 2006 and are expected to settle on or about December 15, 2006. | |
| Key Terms | |||
Index: |
The Nikkei 225
Index (the Index) |
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| $1,000 +[$1,000 x (Index Return x 2)] | |||
| Your principal is protected against up to a 10% decline of the Index at maturity. If the Ending Index Level declines from the Initial Index Level by 10% or less, you will receive the principal amount of your notes at maturity. | |||
| If the Ending Index Level declines from the Initial Index Level by more than 10%, you will lose 1.1111% of the principal amount of your notes for every 1% that the Index declines below 10% of the Initial Index Level and your final payment per $1,000 principal amount note will be calculated as follows: | |||
| $1,000 + [$1,000 x (Index Return + 10%) x 1.1111] | |||
You will lose some or all of your investment at maturity if the Ending Index Level declines from the Initial Index Level by more than 10%. |
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Buffer Amount: |
10% |
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| Downside Factor: | 1.1111 | ||
| Index Return: | The performance of the Index from the Initial Index Level to the Ending Index Level, calculated as follows: | ||
| Ending Index Level Initial
Index Level Initial Index Level |
The Index Return may be positive or negative. |
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| Initial Index Level: | The Index closing level on the pricing date, which was 16,417.82. | ||
Ending Index Level: |
The arithmetic average of the Index closing levels on each of the five Averaging Dates. |
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| Averaging Dates: | January 7, 2008, January 8, 2008, January 9, 2008, January 10, 2008, and January 11, 2008 | ||
| Maturity Date: | January 17, 2008 | ||
| Listing: | The notes will not be listed on any securities exchange. | ||
| CUSIP: | 61746SDB2 |
| Subject to postponement in the event of a market disruption event as described in the accompanying prospectus supplement for leveraged index-linked securities. |
Investing in the Buffered Return Enhanced Notes involves a number of risks. See Risk Factors beginning on page S-19 of the accompanying prospectus supplement for leveraged index-linked securities and Selected Risk Considerations beginning on page 4 of this pricing supplement.
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of the notes or passed upon the accuracy or the adequacy of this pricing supplement or the accompanying prospectus supplement for leveraged index-linked securities and the prospectus. Any representation to the contrary is a criminal offense.
| Price to Public(1) | Fees(2) | Proceeds to Company | |
| Per note | $1,000 | $10 | $990 |
| Total | $10,235,000 | $29,050 | $10,132,650 |
| (1) | Certain fiduciary accounts will pay a purchase price of $990 per note, and the placement agents with respect to sales made to such accounts will forego any fees. |
| (2) | JPMorgan Chase Bank, N.A. and J.P. Morgan Securities Inc., acting as placement agents for the notes, will receive a fee from the Company of $10.00 per $1,000 principal amount note, but will forego any fees for sales to fiduciary accounts. The total fees represent the amount that the placement agents received from accounts other than such fiduciary accounts. |
JPMorgan
Placement Agent
December 8, 2006
ADDITIONAL TERMS SPECIFIC TO THE NOTES
You should read this pricing supplement together with the prospectus dated January 25, 2006, as supplemented by the prospectus supplement for leveraged index-linked securities dated December 1, 2006. These Buffered Return Enhanced Notes are an issuance of our leveraged index-linked securities and their terms are further described in the prospectus supplement for leveraged index-linked securities. This pricing supplement, together with the documents listed below, contains the terms of the notes, supplements the preliminary terms related hereto dated December 1, 2006 and supersedes all prior or contemporaneous oral statements as well as any other written materials including preliminary or indicative pricing terms, correspondence, trade ideas, structures for implementation, sample structures, brochures or other educational materials. You should carefully consider, among other things, the matters set forth in Risk Factors in the accompanying prospectus supplement for leveraged index-linked securities, as the notes involve risks not associated with conventional debt securities. We urge you to consult your investment, legal, tax, accounting and other advisors before you invest in the notes.
You may access these documents on the SEC Web site at www.sec.gov as follows (or if such address has changed, by reviewing our filings for the relevant date on the SEC Web site):
Terms used in this pricing supplement are defined in the prospectus supplement for leveraged index-linked securities or in the prospectus. As used in this pricing supplement, the Company, we, us, or our refer to Morgan Stanley.
What is the Total Return on the Notes at Maturity Assuming a Range of Performance for the Index?
The following table and graph illustrate the hypothetical total return at maturity on the notes. The total return as used in this pricing supplement is the number, expressed as a percentage, that results from comparing the payment at maturity per $1,000 principal amount note to $1,000. The hypothetical total returns set forth below assume an Initial Index Level of 16,070 and reflect the Maximum Total Return on the notes of 21.30% . The hypothetical total returns set forth below are for illustrative purposes only and may not be the actual total returns applicable to a purchaser of the notes. The numbers appearing in the following table, graph and examples have been rounded for ease of analysis.
| Ending Index Level | Index Return | Total Return |
| 28926.00 | 80.00% | 21.30% |
| 26515.50 | 65.00% | 21.30% |
| 24105.00 | 50.00% | 21.30% |
| 22498.00 | 40.00% | 21.30% |
| 20087.50 | 25.00% | 21.30% |
| 19284.00 | 20.00% | 21.30% |
| 17781.46 | 10.65% | 21.30% |
| 16873.50 | 5.00% | 10.00% |
| 16471.75 | 2.50% | 5.00% |
| 16230.70 | 1.00% | 2.00% |
| 16070.00 | 0.00% | 0.00% |
| 15266.50 | -5.00% | 0.00% |
| 14463.00 | -10.00% | 0.00% |
| 13659.50 | -15.00% | -5.56% |
| 12856.00 | -20.00% | -11.11% |
| 11249.00 | -30.00% | -22.22% |
| 9642.00 | -40.00% | -33.33% |
| 8035.00 | -50.00% | -44.44% |
| 6428.00 | -60.00% | -55.56% |
| 4821.00 | -70.00% | -66.67% |
| 3214.00 | -80.00% | -77.78% |
| 1607.00 | -90.00% | -88.89% |
| 0 | -100.00% | -100.00% |
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Hypothetical Examples of Amounts Payable at Maturity
The following examples illustrate how the total returns set forth in the table and graph above are calculated.
Example 1: The level of the Index increases from the Initial Index Level of 16,070 to an Ending Index Level of 16,873.50. Because the Ending Index Level of 16,873.50 is greater than the Initial Index Level of 16,070 and the Index Return of 5% multiplied by 2 does not exceed the Maximum Total Return of 21.30%, the investor receives a payment at maturity of $1,100 per $1,000 principal amount note calculated as follows:
$1,000 + [$1,000 x (5% x 2)] = $1,100
Example 2: The level of the Index decreases from the Initial Index Level of 16,070 to an Ending Index Level of 14,463. Because the Ending Index Level of 14,463 is less than the Initial Index Level of 16,070 by not more than the Buffer Amount of 10%, the investor will receive a payment at maturity of $1,000 per $1,000 principal amount note.
Example 3: The level of the Index increases from the Initial Index Level of 16,070 to an Ending Index Level of 19,284. Because the Index Return of 20% multiplied by 2 exceeds the Maximum Total Return of 21.30%, the investor receives a payment at maturity of $1,213 per $1,000 principal amount note, the maximum payment on the notes.
Example 4: The level of the Index decreases from the Initial Index Level of 16,070 to an Ending Index Level of 12,856. Because the Ending Index Level of 12,856 is less than the Initial Index Level of 16,070 by more than the Buffer Amount of 10%, the Index Return is negative and the investor will receive a payment at maturity of $888.89 per $1,000 principal amount note calculated as follows:
$1,000 + [$1,000 x (-20% + 10%) x 1.1111] = $888.89
Selected Purchase Considerations
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Selected Risk Considerations
An investment in the notes involves significant risks. Investing in the notes is not equivalent to investing directly in the Index or any of the component stocks of the Index. These risks are explained in more detail in the Risk Factors section of the accompanying prospectus supplement for leveraged index-linked securities.
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Use of Proceeds and Hedging
Part of the net proceeds we receive from the sale of the notes will be used in connection with hedging our obligations under the notes through one or more of our subsidiaries. The hedging or trading activities of our affiliates on or prior to the pricing date and on the Averaging Dates could adversely affect the value of the Index and, as a result, could decrease the amount you may receive on the notes at maturity.
Historical Information
The following graph sets forth the historical performance of the Nikkei 225 Index based on the weekly Index closing levels from January 5, 2001 through December 8, 2006. The Index closing level on December 8, 2006 was 16,417.82. We obtained the Index closing levels below from Bloomberg Financial Markets, without independent verification. We make no representation or warranty as to the accuracy or completeness of the information obtained from Bloomberg Financial Markets. The price source for determining the Ending Index Level will be the Bloomberg page NKY or any successor page.
The historical levels of the Index should not be taken as an indication of future performance, and no assurance can be given as to the Index closing level on any of the Averaging Dates. We cannot give you assurance that the performance of the Index will result in the return of any of your initial investment.

License Agreements
License Agreement between Nihon Keizai Shimbun, Inc. and Morgan Stanley. As of the issue date of any notes, we will have received the consent of Nihon Keizai Shimbun, Inc., the publisher of the Nikkei 225 Index, to use and refer to the Nikkei 225 Index in connection with the notes. Nihon Keizai Shimbun, Inc. has the copyright to the Nikkei 225 Index. All rights to the Nikkei 225 Index are owned by Nihon Keizai Shimbun, Inc. See Underlying Indices and Underlying Index Publishers InformationNikkei 225 IndexLicense Agreement between NIKKEI and Morgan Stanley in Annex A of the prospectus supplement for leveraged index-linked securities.
ERISA
See ERISA in the prospectus supplement for leveraged index-linked securities.
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