In this paper we consider a market situation in which initially there is an unintegrated monopoly upstream that owns an important facility and two dowstream firms. Then the market is liberalized allowing upstream entry and vertical integration. The equilibrium entry mode–sharing the incumbent facility or building a new facility– is derived as well as the
Financial time-series may exhibit breakpoints in unconditional variance due, possibly, to institutional changes. Accounting for such shifts is essential to risk management, forecasting, and hedging. In this article, we test for the presence of structural breaks in volatility by two approaches: the Iterative Cumulative Sum of Squares (ICSS) algorithm and wavelet analysis. We present a