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Net Income per Share (Details 1) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Net income attributable to MercadoLibre, Inc per common share |  |
Basic net income attributable to MercadoLibre, Inc. per common share | $ 0.45 | $ 0.32
Diluted net income attributable to MercadoLibre, Inc. per common share | $ 0.45 | $ 0.32
Numerator: |  |
Net income attributable to MercadoLibre, Inc., Basic | $ 19,950,908 | $ 14,057,634
Net income attributable to MercadoLibre, Inc., Diluted | $ 19,950,908 | $ 14,057,634
Denominator: |  |
Weighted average of common stock outstanding for Basic earnings per share | 44,142,076 | 44,131,383
Adjustment for stock options | 5,720 | 11,474
Adjustment for shares granted under LTRP |  | 4,810
Adjusted weighted average of common stock outstanding for Diluted earnings per share | 44,147,796 | 44,147,667

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