For example, staying within the context of the LID assumptions, we will need to
further assume that all firms have identical AR(1) persistence parameters in abnormal
earnings (i.e., that (o is a cross-sectional constant), that firms have identical discount
rates (r^ is identical across firms), and that nonaccoimting information (V^) is either
value irrelevant or affects all firms in exactly the same way. These highly restrictive
assumptions are not part of the original RIM, or even Ohlson (1995). In fact, if these
assumptions were empirically descriptive, we need only to use market multiples (e.g.,
P/E and P/B ratios) for valuation. We do not need a more elaborate valuation model.
For example, staying within the context of the LID assumptions, we will need tofurther assume that all firms have identical AR(1) persistence parameters in abnormalearnings (i.e., that (o is a cross-sectional constant), that firms have identical discountrates (r^ is identical across firms), and that nonaccoimting information (V^) is eithervalue irrelevant or affects all firms in exactly the same way. These highly restrictiveassumptions are not part of the original RIM, or even Ohlson (1995). In fact, if theseassumptions were empirically descriptive, we need only to use market multiples (e.g.,P/E and P/B ratios) for valuation. We do not need a more elaborate valuation model.
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