List of Articles Johansen Co-Integration Open Access Article Abstract Page Full-Text 1 - Augmented Dickey Fuller and Johansen Co-integration Tests of Oil Price Volatility and Stock Price in Emerging Capital Market: A Case of Nigeria E. Godsday Okoro Open Access Article Abstract Page Full-Text 2 - Studying the Law of Unit Price in Tehran's Vegetable Markets: Case Study of Tomato and Potato Pedram Mohaghegh Reza Moghaddasi