Capital Asset Pricing Model (CAPM)
Capital asset pricing model (CAPM) indicates what should be the expected or required rate of return on risky assets like Best Buy Co. Inc. common stock.
Rates of Return
Best Buy Co. Inc., monthly rates of return
| Best Buy Co. Inc. (BBY) | Standard & Poor’s 500 (S&P 500) | |||||
|---|---|---|---|---|---|---|
| t | Date | PriceBBY,t1 | DividendBBY,t1 | RBBY,t2 | PriceS&P 500,t | RS&P 500,t3 |
| Feb 29, 2016 | $32.39 | 1,932.23 | ||||
| 1. | Mar 31, 2016 | $32.44 | $0.73 | 2.41% | 2,059.74 | 6.60% |
| 2. | Apr 30, 2016 | $32.08 | -1.11% | 2,065.30 | 0.27% | |
| 3. | May 31, 2016 | $32.17 | 0.28% | 2,096.95 | 1.53% | |
| . | . | . | . | . | . | . |
| . | . | . | . | . | . | . |
| . | . | . | . | . | . | . |
| 70. | Dec 31, 2021 | $101.60 | $0.70 | -4.27% | 4,766.18 | 4.36% |
| 71. | Jan 31, 2022 | $99.28 | -2.28% | 4,515.55 | -5.26% | |
| Average (R): | 2.32% | 1.29% | ||||
| Standard deviation: | 9.91% | 4.25% | ||||
| Best Buy Co. Inc. (BBY) | Standard & Poor’s 500 (S&P 500) | |||||
|---|---|---|---|---|---|---|
| t | Date | PriceBBY,t1 | DividendBBY,t1 | RBBY,t2 | PriceS&P 500,t | RS&P 500,t3 |
| Feb 29, 2016 | $32.39 | 1,932.23 | ||||
| 1. | Mar 31, 2016 | $32.44 | $0.73 | 2.41% | 2,059.74 | 6.60% |
| 2. | Apr 30, 2016 | $32.08 | -1.11% | 2,065.30 | 0.27% | |
| 3. | May 31, 2016 | $32.17 | 0.28% | 2,096.95 | 1.53% | |
| 4. | Jun 30, 2016 | $30.60 | $0.28 | -4.01% | 2,098.86 | 0.09% |
| 5. | Jul 31, 2016 | $33.60 | 9.80% | 2,173.60 | 3.56% | |
| 6. | Aug 31, 2016 | $38.48 | 14.52% | 2,170.95 | -0.12% | |
| 7. | Sep 30, 2016 | $38.18 | $0.28 | -0.05% | 2,168.27 | -0.12% |
| 8. | Oct 31, 2016 | $38.91 | 1.91% | 2,126.15 | -1.94% | |
| 9. | Nov 30, 2016 | $45.70 | 17.45% | 2,198.81 | 3.42% | |
| 10. | Dec 31, 2016 | $42.67 | $0.28 | -6.02% | 2,238.83 | 1.82% |
| 11. | Jan 31, 2017 | $44.52 | 4.34% | 2,278.87 | 1.79% | |
| 12. | Feb 28, 2017 | $44.13 | -0.88% | 2,363.64 | 3.72% | |
| 13. | Mar 31, 2017 | $49.15 | $0.34 | 12.15% | 2,362.72 | -0.04% |
| 14. | Apr 30, 2017 | $51.81 | 5.41% | 2,384.20 | 0.91% | |
| 15. | May 31, 2017 | $59.39 | 14.63% | 2,411.80 | 1.16% | |
| 16. | Jun 30, 2017 | $57.33 | $0.34 | -2.90% | 2,423.41 | 0.48% |
| 17. | Jul 31, 2017 | $58.34 | 1.76% | 2,470.30 | 1.93% | |
| 18. | Aug 31, 2017 | $54.26 | -6.99% | 2,471.65 | 0.05% | |
| 19. | Sep 30, 2017 | $56.96 | $0.34 | 5.60% | 2,519.36 | 1.93% |
| 20. | Oct 31, 2017 | $55.98 | -1.72% | 2,575.26 | 2.22% | |
| 21. | Nov 30, 2017 | $59.61 | 6.48% | 2,647.58 | 2.81% | |
| 22. | Dec 31, 2017 | $68.47 | $0.34 | 15.43% | 2,673.61 | 0.98% |
| 23. | Jan 31, 2018 | $73.06 | 6.70% | 2,823.81 | 5.62% | |
| 24. | Feb 28, 2018 | $72.44 | -0.85% | 2,713.83 | -3.89% | |
| 25. | Mar 31, 2018 | $69.99 | $0.45 | -2.76% | 2,640.87 | -2.69% |
| 26. | Apr 30, 2018 | $76.53 | 9.34% | 2,648.05 | 0.27% | |
| 27. | May 31, 2018 | $68.25 | -10.82% | 2,705.27 | 2.16% | |
| 28. | Jun 30, 2018 | $74.58 | $0.45 | 9.93% | 2,718.37 | 0.48% |
| 29. | Jul 31, 2018 | $75.03 | 0.60% | 2,816.29 | 3.60% | |
| 30. | Aug 31, 2018 | $79.56 | 6.04% | 2,901.52 | 3.03% | |
| 31. | Sep 30, 2018 | $79.36 | $0.45 | 0.31% | 2,913.98 | 0.43% |
| 32. | Oct 31, 2018 | $70.16 | -11.59% | 2,711.74 | -6.94% | |
| 33. | Nov 30, 2018 | $64.59 | -7.94% | 2,760.17 | 1.79% | |
| 34. | Dec 31, 2018 | $52.96 | $0.45 | -17.31% | 2,506.85 | -9.18% |
| 35. | Jan 31, 2019 | $59.24 | 11.86% | 2,704.10 | 7.87% | |
| 36. | Feb 28, 2019 | $68.84 | 16.21% | 2,784.49 | 2.97% | |
| 37. | Mar 31, 2019 | $71.06 | $0.50 | 3.95% | 2,834.40 | 1.79% |
| 38. | Apr 30, 2019 | $74.41 | 4.71% | 2,945.83 | 3.93% | |
| 39. | May 31, 2019 | $62.67 | -15.78% | 2,752.06 | -6.58% | |
| 40. | Jun 30, 2019 | $69.73 | $0.50 | 12.06% | 2,941.76 | 6.89% |
| 41. | Jul 31, 2019 | $76.53 | 9.75% | 2,980.38 | 1.31% | |
| 42. | Aug 31, 2019 | $63.65 | -16.83% | 2,926.46 | -1.81% | |
| 43. | Sep 30, 2019 | $68.99 | $0.50 | 9.18% | 2,976.74 | 1.72% |
| 44. | Oct 31, 2019 | $71.83 | 4.12% | 3,037.56 | 2.04% | |
| 45. | Nov 30, 2019 | $80.64 | 12.27% | 3,140.98 | 3.40% | |
| 46. | Dec 31, 2019 | $87.80 | $0.50 | 9.50% | 3,230.78 | 2.86% |
| 47. | Jan 31, 2020 | $84.69 | -3.54% | 3,225.52 | -0.16% | |
| 48. | Feb 29, 2020 | $75.65 | -10.67% | 2,954.22 | -8.41% | |
| 49. | Mar 31, 2020 | $57.00 | $0.55 | -23.93% | 2,584.59 | -12.51% |
| 50. | Apr 30, 2020 | $76.73 | 34.61% | 2,912.43 | 12.68% | |
| 51. | May 31, 2020 | $78.09 | 1.77% | 3,044.31 | 4.53% | |
| 52. | Jun 30, 2020 | $87.27 | $0.55 | 12.46% | 3,100.29 | 1.84% |
| 53. | Jul 31, 2020 | $99.59 | 14.12% | 3,271.12 | 5.51% | |
| 54. | Aug 31, 2020 | $110.91 | 11.37% | 3,500.31 | 7.01% | |
| 55. | Sep 30, 2020 | $111.29 | $0.55 | 0.84% | 3,363.00 | -3.92% |
| 56. | Oct 31, 2020 | $111.55 | 0.23% | 3,269.96 | -2.77% | |
| 57. | Nov 30, 2020 | $108.80 | -2.47% | 3,621.63 | 10.75% | |
| 58. | Dec 31, 2020 | $99.79 | $0.55 | -7.78% | 3,756.07 | 3.71% |
| 59. | Jan 31, 2021 | $108.82 | 9.05% | 3,714.24 | -1.11% | |
| 60. | Feb 28, 2021 | $100.35 | -7.78% | 3,811.15 | 2.61% | |
| 61. | Mar 31, 2021 | $114.81 | $0.70 | 15.11% | 3,972.89 | 4.24% |
| 62. | Apr 30, 2021 | $116.27 | 1.27% | 4,181.17 | 5.24% | |
| 63. | May 31, 2021 | $116.24 | -0.03% | 4,204.11 | 0.55% | |
| 64. | Jun 30, 2021 | $114.98 | $0.70 | -0.48% | 4,297.50 | 2.22% |
| 65. | Jul 31, 2021 | $112.35 | -2.29% | 4,395.26 | 2.27% | |
| 66. | Aug 31, 2021 | $116.51 | 3.70% | 4,522.68 | 2.90% | |
| 67. | Sep 30, 2021 | $105.71 | $0.70 | -8.67% | 4,307.54 | -4.76% |
| 68. | Oct 31, 2021 | $122.24 | 15.64% | 4,605.38 | 6.91% | |
| 69. | Nov 30, 2021 | $106.86 | -12.58% | 4,567.00 | -0.83% | |
| 70. | Dec 31, 2021 | $101.60 | $0.70 | -4.27% | 4,766.18 | 4.36% |
| 71. | Jan 31, 2022 | $99.28 | -2.28% | 4,515.55 | -5.26% | |
| Average (R): | 2.32% | 1.29% | ||||
| Standard deviation: | 9.91% | 4.25% | ||||
Show all
1 Data in US$ per share of common stock, adjusted for splits and stock dividends.
2 Rate of return on common stock of BBY during period t
3 Rate of return on S&P 500 (the market portfolio proxy) during period t
Variance and Covariance
Best Buy Co. Inc., calculation of variance and covariance of returns
| t | Date | RBBY,t | RS&P 500,t | (RBBY,t–RBBY)2 | (RS&P 500,t–RS&P 500)2 | (RBBY,t–RBBY)×(RS&P 500,t–RS&P 500) |
|---|---|---|---|---|---|---|
| 1. | Mar 31, 2016 | 2.41% | 6.60% | 0.01 | 28.16 | 0.48 |
| 2. | Apr 30, 2016 | -1.11% | 0.27% | 11.75 | 1.05 | 3.50 |
| 3. | May 31, 2016 | 0.28% | 1.53% | 4.15 | 0.06 | -0.49 |
| . | . | . | . | . | . | . |
| . | . | . | . | . | . | . |
| . | . | . | . | . | . | . |
| 70. | Dec 31, 2021 | -4.27% | 4.36% | 43.37 | 9.42 | -20.21 |
| 71. | Jan 31, 2022 | -2.28% | -5.26% | 21.17 | 42.91 | 30.14 |
| Total (Σ): | 6,868.63 | 1,262.70 | 1,873.35 | |||
| t | Date | RBBY,t | RS&P 500,t | (RBBY,t–RBBY)2 | (RS&P 500,t–RS&P 500)2 | (RBBY,t–RBBY)×(RS&P 500,t–RS&P 500) |
|---|---|---|---|---|---|---|
| 1. | Mar 31, 2016 | 2.41% | 6.60% | 0.01 | 28.16 | 0.48 |
| 2. | Apr 30, 2016 | -1.11% | 0.27% | 11.75 | 1.05 | 3.50 |
| 3. | May 31, 2016 | 0.28% | 1.53% | 4.15 | 0.06 | -0.49 |
| 4. | Jun 30, 2016 | -4.01% | 0.09% | 40.04 | 1.44 | 7.60 |
| 5. | Jul 31, 2016 | 9.80% | 3.56% | 56.04 | 5.15 | 16.98 |
| 6. | Aug 31, 2016 | 14.52% | -0.12% | 148.98 | 2.00 | -17.26 |
| 7. | Sep 30, 2016 | -0.05% | -0.12% | 5.62 | 2.00 | 3.36 |
| 8. | Oct 31, 2016 | 1.91% | -1.94% | 0.16 | 10.46 | 1.31 |
| 9. | Nov 30, 2016 | 17.45% | 3.42% | 228.99 | 4.52 | 32.16 |
| 10. | Dec 31, 2016 | -6.02% | 1.82% | 69.48 | 0.28 | -4.40 |
| 11. | Jan 31, 2017 | 4.34% | 1.79% | 4.07 | 0.25 | 1.00 |
| 12. | Feb 28, 2017 | -0.88% | 3.72% | 10.20 | 5.89 | -7.75 |
| 13. | Mar 31, 2017 | 12.15% | -0.04% | 96.59 | 1.77 | -13.08 |
| 14. | Apr 30, 2017 | 5.41% | 0.91% | 9.57 | 0.15 | -1.19 |
| 15. | May 31, 2017 | 14.63% | 1.16% | 151.60 | 0.02 | -1.66 |
| 16. | Jun 30, 2017 | -2.90% | 0.48% | 27.19 | 0.66 | 4.23 |
| 17. | Jul 31, 2017 | 1.76% | 1.93% | 0.31 | 0.41 | -0.36 |
| 18. | Aug 31, 2017 | -6.99% | 0.05% | 86.70 | 1.53 | 11.52 |
| 19. | Sep 30, 2017 | 5.60% | 1.93% | 10.79 | 0.41 | 2.10 |
| 20. | Oct 31, 2017 | -1.72% | 2.22% | 16.31 | 0.86 | -3.74 |
| 21. | Nov 30, 2017 | 6.48% | 2.81% | 17.36 | 2.30 | 6.32 |
| 22. | Dec 31, 2017 | 15.43% | 0.98% | 172.02 | 0.10 | -4.05 |
| 23. | Jan 31, 2018 | 6.70% | 5.62% | 19.23 | 18.71 | 18.97 |
| 24. | Feb 28, 2018 | -0.85% | -3.89% | 10.03 | 26.90 | 16.43 |
| 25. | Mar 31, 2018 | -2.76% | -2.69% | 25.80 | 15.85 | 20.22 |
| 26. | Apr 30, 2018 | 9.34% | 0.27% | 49.37 | 1.04 | -7.17 |
| 27. | May 31, 2018 | -10.82% | 2.16% | 172.59 | 0.75 | -11.41 |
| 28. | Jun 30, 2018 | 9.93% | 0.48% | 58.00 | 0.65 | -6.15 |
| 29. | Jul 31, 2018 | 0.60% | 3.60% | 2.94 | 5.34 | -3.96 |
| 30. | Aug 31, 2018 | 6.04% | 3.03% | 13.84 | 3.01 | 6.45 |
| 31. | Sep 30, 2018 | 0.31% | 0.43% | 4.02 | 0.74 | 1.73 |
| 32. | Oct 31, 2018 | -11.59% | -6.94% | 193.51 | 67.78 | 114.52 |
| 33. | Nov 30, 2018 | -7.94% | 1.79% | 105.21 | 0.24 | -5.06 |
| 34. | Dec 31, 2018 | -17.31% | -9.18% | 385.23 | 109.62 | 205.50 |
| 35. | Jan 31, 2019 | 11.86% | 7.87% | 91.01 | 43.25 | 62.74 |
| 36. | Feb 28, 2019 | 16.21% | 2.97% | 192.86 | 2.82 | 23.34 |
| 37. | Mar 31, 2019 | 3.95% | 1.79% | 2.67 | 0.25 | 0.82 |
| 38. | Apr 30, 2019 | 4.71% | 3.93% | 5.74 | 6.96 | 6.32 |
| 39. | May 31, 2019 | -15.78% | -6.58% | 327.44 | 61.94 | 142.41 |
| 40. | Jun 30, 2019 | 12.06% | 6.89% | 94.97 | 31.37 | 54.58 |
| 41. | Jul 31, 2019 | 9.75% | 1.31% | 55.26 | 0.00 | 0.15 |
| 42. | Aug 31, 2019 | -16.83% | -1.81% | 366.65 | 9.62 | 59.39 |
| 43. | Sep 30, 2019 | 9.18% | 1.72% | 47.02 | 0.18 | 2.92 |
| 44. | Oct 31, 2019 | 4.12% | 2.04% | 3.23 | 0.56 | 1.35 |
| 45. | Nov 30, 2019 | 12.27% | 3.40% | 98.94 | 4.46 | 21.01 |
| 46. | Dec 31, 2019 | 9.50% | 2.86% | 51.57 | 2.45 | 11.25 |
| 47. | Jan 31, 2020 | -3.54% | -0.16% | 34.34 | 2.12 | 8.53 |
| 48. | Feb 29, 2020 | -10.67% | -8.41% | 168.80 | 94.15 | 126.07 |
| 49. | Mar 31, 2020 | -23.93% | -12.51% | 688.75 | 190.56 | 362.28 |
| 50. | Apr 30, 2020 | 34.61% | 12.68% | 1,043.04 | 129.78 | 367.92 |
| 51. | May 31, 2020 | 1.77% | 4.53% | 0.30 | 10.47 | -1.77 |
| 52. | Jun 30, 2020 | 12.46% | 1.84% | 102.86 | 0.30 | 5.54 |
| 53. | Jul 31, 2020 | 14.12% | 5.51% | 139.22 | 17.79 | 49.77 |
| 54. | Aug 31, 2020 | 11.37% | 7.01% | 81.88 | 32.65 | 51.71 |
| 55. | Sep 30, 2020 | 0.84% | -3.92% | 2.19 | 27.20 | 7.72 |
| 56. | Oct 31, 2020 | 0.23% | -2.77% | 4.34 | 16.47 | 8.46 |
| 57. | Nov 30, 2020 | -2.47% | 10.75% | 22.88 | 89.54 | -45.26 |
| 58. | Dec 31, 2020 | -7.78% | 3.71% | 101.88 | 5.86 | -24.43 |
| 59. | Jan 31, 2021 | 9.05% | -1.11% | 45.31 | 5.79 | -16.19 |
| 60. | Feb 28, 2021 | -7.78% | 2.61% | 102.04 | 1.73 | -13.30 |
| 61. | Mar 31, 2021 | 15.11% | 4.24% | 163.56 | 8.71 | 37.75 |
| 62. | Apr 30, 2021 | 1.27% | 5.24% | 1.09 | 15.60 | -4.13 |
| 63. | May 31, 2021 | -0.03% | 0.55% | 5.49 | 0.55 | 1.74 |
| 64. | Jun 30, 2021 | -0.48% | 2.22% | 7.84 | 0.86 | -2.60 |
| 65. | Jul 31, 2021 | -2.29% | 2.27% | 21.21 | 0.97 | -4.53 |
| 66. | Aug 31, 2021 | 3.70% | 2.90% | 1.92 | 2.58 | 2.22 |
| 67. | Sep 30, 2021 | -8.67% | -4.76% | 120.71 | 36.59 | 66.46 |
| 68. | Oct 31, 2021 | 15.64% | 6.91% | 177.40 | 31.61 | 74.88 |
| 69. | Nov 30, 2021 | -12.58% | -0.83% | 222.00 | 4.52 | 31.67 |
| 70. | Dec 31, 2021 | -4.27% | 4.36% | 43.37 | 9.42 | -20.21 |
| 71. | Jan 31, 2022 | -2.28% | -5.26% | 21.17 | 42.91 | 30.14 |
| Total (Σ): | 6,868.63 | 1,262.70 | 1,873.35 | |||
Show all
VarianceBBY = Σ(RBBY,t–RBBY)2 ÷ (71 – 1)
= 6,868.63 ÷ (71 – 1)
= 98.12
VarianceS&P 500 = Σ(RS&P 500,t–RS&P 500)2 ÷ (71 – 1)
= 1,262.70 ÷ (71 – 1)
= 18.04
CovarianceBBY, S&P 500 = Σ(RBBY,t–RBBY)×(RS&P 500,t–RS&P 500) ÷ (71 – 1)
= 1,873.35 ÷ (71 – 1)
= 26.76
Systematic Risk (β) Estimation
| VarianceBBY | 98.12 |
| VarianceS&P 500 | 18.04 |
| CovarianceBBY, S&P 500 | 26.76 |
| Correlation coefficientBBY, S&P 5001 | 0.64 |
| βBBY2 | 1.48 |
| αBBY3 | 0.40% |
Calculations
1 Correlation coefficientBBY, S&P 500
= CovarianceBBY, S&P 500 ÷ (Standard deviationBBY × Standard deviationS&P 500)
= 26.76 ÷ (9.91% × 4.25%)
= 0.64
2 βBBY
= CovarianceBBY, S&P 500 ÷ VarianceS&P 500
= 26.76 ÷ 18.04
= 1.48
3 αBBY
= AverageBBY – βBBY × AverageS&P 500
= 2.32% – 1.48 × 1.29%
= 0.40%
Expected Rate of Return
| Assumptions | ||
| Rate of return on LT Treasury Composite1 | RF | 4.76% |
| Expected rate of return on market portfolio2 | E(RM) | 14.91% |
| Systematic risk (β) of Best Buy Co. Inc. common stock | βBBY | 1.48 |
| Expected rate of return on Best Buy Co. Inc. common stock3 | E(RBBY) | 19.82% |
1 Unweighted average of bid yields on all outstanding fixed-coupon U.S. Treasury bonds neither due or callable in less than 10 years (risk-free rate of return proxy).
3 E(RBBY) = RF + βBBY [E(RM) – RF]
= 4.76% + 1.48 [14.91% – 4.76%]
= 19.82%