Wrote Analysts has just used the CAPM model to compute an rE of 18.679% for the VaperWare company. It found rE by, among other things, computing Beta from a regression between the historical stock returns of Vaperware and the SPY ETF. The R2 of this regression was 12%.
Required:
What could possibly be problematic with WroteAnalysts' estimated rE for the VaperWare company?