Growth is a key objective of developing nations, including Nigeria. However, inefficiency of stock markets can pose real dangers to the economic growth of any nation through misallocation of scarce investible resources. This study investigates weak-form of the Nigerian stock market in the context of the Efficient Market Hypothesis. The stock market prices were modeled to test for weak-form efficiency-the search for serial correlation, which will indicate whether or not current stock market prices depend on previous prices. Using monthly time-series data from 1985-2010, a unit root test and regression analysis involving both the least squares and two stage least squares estimation techniques was used to test efficiency of the Nigerian Stock Exchange. The results revealed that the market was not efficient and also indicates the presence of market seasonality. It is , therefore, recommended that there is a strong need to put in place policy measures that would guarantee competitive participation and avoid the "buy and hold" attitude of securities by investors which have delayed the rapid development of Nigeria's national economy.

1. Akpan, I. (2004). 'Fundamentals of Finance.' (2nd edition), Uyo; Nelgrafik Press. pp. 33-38.
2. Alice, H. I. & Anao, A. R. (1986). 'The Nigerian Stock Market In Operation.' Ikeja; Jerome Larlto and Associates pp.78-80.
3. Asalu, N. (1996). 'Research Methodology In The Behavioral Sciences.' Lagos: Longman. pp. 103-105.
4. Anyanwu, D. C. (1993). 'Monetary Economics.' Owerri: Hybrid Publishers. p.57.
5. Ayadi, O. (1984). “Random Walk Hypothesis And The Behaviour Of Stock Prices In Nigeria.” The Nigerian Journal of Economics and Social Studies, Volume 1, Issue 25, pp.7-8.
6. Baumol, W. (1965). “The Stock Market And Economic Efficiency.” New York: Fordham University Press. pp. 36-42.
7. Copeland, T. E. and Weston J. F. (1983). 'Financial Theory And Corporate Policy.' 2nd Ed. New Jersey; Prentice-Hall Incorporated. pp. 381-387.
8. Fama, E. F. (1970). “Efficient Capital Market: A Review Of Theory And Empirical Work.” Journal of Finance, Volume 4, Issue 5, pp.18-20.
9. Foley, B. J. (1991). “Capital Markets.” Hong-Kong: Macmillan.
10. French, D. W. (1989). “Security And Portfolio Analysis, Concepts And Management.” London: Merill Publishers, pp.88-91.
11. Jensen, M. (1978). “Some Anomalous Evidence Regarding Market Efficiency.” Journal of Financial Economics, Volume 3, Issue 6, pp. 12-17.
12. Kitchen, R. (1993). 'Finance For The Developing Countries.' New York: John Wiley. pp. 45-63.
13. Khoury, D. S. (1983). 'Investment Management: Theory And Application.' New York: Macmillan publishes. p. 69.
14. Mbat, D. O. (2001). “Financial Management.” Uyo; Domes Associates. pp. 87-90.
15. Nwankwo, G. O. (1980). “The Nigerian Financial System.” London: Macmillan pp. 265-271.
16. Nzotta, S. M. (2004). 'Money, Banking And Finance.' Owerri; Hudson-Jude Nigeria Publishers. pp. 204-210.
17. Odife, D. O. (1990). 'Improving The Operational Efficiency Of The Nigerian Capital Market.' Securities And Exchange Commission Seminar On Ten Years Of Securities Regulation In Nigeria, Lagos.p.19.
18. Odoko, N. S. (2004). 'Financial Markets In Nigeria.' Abuja; CBN Publication.
19. Olowe, R. A. (1997). 'Financial Management.' Lagos: Brierly Domes. pp. 245-253.
20. Olowe, R. A. (2004). 'Financial Management.' Lagos: Brierly Domes. pp. 295-299.
21. Onoh, D. K. (2002). “An Dynamics Of Money, Banking And Finance In Nigeria Emerging Market.” Lagos: Astra Meridian. pp. 180-200.
22. Osaze, B. E. (2005). “The Capital Market: It's Nature And Operational Character.” Benin: Bob Osaze. pp. 58-60.
23. Osisioma, B. C. (1989). “Capital Market Efficiency In Nigeria.” Unpublished PhD Thesis. Faculty of Management Sciences, University of Nigeria, Nsukka.
24. Securities and Exchange Commission (2005a). “20 years of Securities Market Regulation In Nigeria.” Abuja: Securities and Exchange Commission, Volume 20, Issue 4, pp. 16-17.
25. Securities and Exchange Commission (2005b). SEC Quarterly. Volume 20, Issue 4, pp. 3-17.
26. Thygerson, K. J. (1993). 'Financial Market Institution: A Managerial Approach.' New York: Harper Collins College Publications. pp. 147-152.
27. Tobin, J. (1958). “Liquidity Preferences As Behaviour Towards Risk.” Review of Economic Studies, Volume 2, Issue 4, pp. 30-32.
28. Udo S. N. (2002). “The Nigerian Bond Market.” Lagos: Consolidated Securities and Investment. pp.30-33.
29. Yacout, N. (1980). “Capital Markets In Developing Countries.” Unpublished PhD Thesis, Faculty University of Birmingham. pp. 78-89.