The value relevance of earnings and nonearnings information in regulated and deregulated markets: The case of the airline industry

This paper examines the valuation effects of earnings and two nonearnings-based measurements (book values and operating cash flow) on security prices of airline companies under two different market structures: regulated and deregulated. The literature lacks empirical evidence in examining the relative importance of earnings and nonearnings accounting-based measurements in regulated and deregulated markets, especially in the airlines industry. We compare coefficient estimates of regressing stock prices on earnings, book value, and cash flow from operations of airline companies during regulated and deregulated times. A control sample of manufacturing companies is also used for supporting inferences from the airline sample's findings. In a typical regulated market, using cost recovery plus an adequate rate of return on assets, security prices are highly aligned with nonearnings measurements such as the book value. In the airline industry, regulation took the form of guaranteed routes and subsidies to service rural areas, giving rise to a differential effect of both earnings and nonearnings measurements. Under deregulation, airline firms operate in highly competitive markets with large airline firms enjoying the benefits of economy of scale and service diversification. Thus, the asset capitalization (book value), cash flow, and operational efficiencies (earnings) would be major indicators in the market assessment of the firm's future profitability and security price. This paper finds that nonearnings measures have higher explanatory power of security prices in regulated times for the airline firms. In deregulated times, although earnings have a stronger relationship with prices, nonearnings measures continued to influence stock price levels, reflecting airline specific economics. © nternational Atlantic Economic Society 2008.