A lot is at stake in the stock market because average stock valuations are in high-normal range. Most analysts agree that if the average P/E Ratio of S&P 500 is anything greater than 20, it means stocks are in a rather high-priced region. There are several factors however that might create problems. To know more go through the article by Julian Close (business writer, PRA International and the United Nations Department of Peacekeeping) at: http://www.marketintelligencecenter.com/articles/612420
