We study the effects of market structure on entry using data from the UK fast food (counter-service burger) industry over the years 1991-1995. Over this period, the market can be characterized as a duopoly. We find that market structure matters greatly: for both firms, rival presence increases the probability of entry. We control for market specific time-invariant unobservables and their correl...

Abstract The ancient Zoroastrian hymn of worship dedicated to the frauuaṣ̌i- s (affirmative choices) righteous mortals and divinities refers an important discourse that takes place between unnamed poet-sage his mysterious rival, named Gaōtəma. figure Gaōtəma has intrigued Avestan scholars through years, but significance implications Gaōtəma's identity, presence in hymn, date not been seriously s...

Abstract In surveying finite populations, the simplest strategy to estimate a population total without bias is employ Simple Random Sampling (SRS) with replacement (SRSWR) and expansion estimator based on it. Anything other than that including SRS Without Replacement (SRSWOR) usage of complex strategy. We examine here (1) if from sample at hand gain in efficiency may be unbiasedly estimated com...